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Sometimes you develop a part of your design that can be reused elsewhere in the project. You could simply use copy and paste for such items, but a better choice is to create a group. A group gives you a powerful way to manage repetitive items. Once you create a group if you make a change to one instance of the group, that change occurs across the entire project. So to demonstrate that I'm going to work here in this file called Create a Group and we are going to use our condo layout that we've been working on for the last several movies. I'm going to zoom out just a touch here and make a window selection around everything that I have on the screen, and then up here on the ribbon we will find our Create Group command or we can type GP.
A dialog will appear which actually indicates for me that I'm really creating two groups. The model geometry such as the walls, doors, and windows will go in the first group and I'm going to name that 2 Bedroom Unit, and this is a model group. Model groups contain model geometry. All of the annotation like the room tags and the door tags are going to go in an attached detail group and I'm going to call that one Tags. Now the way this works is, if I deselect this and I kind of move my mouse nearby, you'll see this dash line appearing around the entire file.
That is the group now and that's the model group right there. Notice it only highlighted the model geometry. And I'm going to deselect that, move my mouse over here, and you'll see it's highlighting another dash line, that's the Tags and that is the attached detail group and that's kind of confirmed for me here with this small little pushpin icon letting me know that that's attached to something. Now if we scroll down here on the Project Browser, expand the Groups category, and expand Model, we'll see our 2 Bedroom Unit listed here.
Beneath it, we'll see Floor Plan Tags. That's the attached detail group. So that's another way that we can see those two items that we've created. If I select the model group, you'll see here in the center that it's got this X Y icon right here. Now what that's useful for is I can actually drag that to any location that I would like to be the origin for this group. Now in this case I'm going to drag it up here to the endpoint of these two exterior walls. And what that does for me is I'm going to deselect it and I'm going to select my 2 Bedroom Unit, drag it from Project Browser and drop it into a file.
And what you'll see is, let me zoom out slightly here. You'll see that that new location that I just indicated is the insertion point of this group now. And let me press Escape to get out of there. So if you have a more convenient point that you want to use for an insertion point, it's as easy as that to make that change. What's the advantage of using a group in the first place? Well, now that I have my group, all I have to do is select any instance of the group, and I'm just going to pick the one here on the left, and up here on the ribbon, I can choose the Edit Group button or E G is the shortcut.
That will take me into group edit mode and you could see that I can now touch all the individual geometry again. And I could make any change that I want to here to the group. I'm going to do something that's just simple and obvious. So up here on the Architecture ribbon, I'm going to click the Window tool, open up the list of choices, and I'm going to pick this 72x48 double casement window. And I'm just going to place an instance of that here in this bedroom. When I click Finish right here, I want you to pay attention to this wall right there.
Notice that in this instance of the group, it gained that same window over there. So if you can imagine if we had dozens if not hundreds of instances of this group throughout the project how powerful that could be. We make the change in one location and that change will immediately apply throughout the rest of the project. Now we've got our attach detail group here as well, and if I take a look at this, this is attached to all of the different elements in the group. This one however is just the model group.
It doesn't have those elements. Well, it turns out that all I have to do is select it and then on the ribbon right here I can click Attach Detail Groups. That will show me any attached detail groups that belong to this group. In this case the Floor Plan Tags. I'm going to check that, and when I click OK, it will add an instance of that Attach Detail Group to this model instance. More importantly, if I zoom in over here notice that in this area, this is door number 5, door number 4, door number 8.
Notice that these doors have renumbered to have unique numbers. So Revit won't replicate the same numbering. It will renumber the objects for you. Now if you don't like the number, you can always renumber them later and that will be a subject of a later movie. But it's really a powerful feature that it maintains all that numbering for you automatically and all you have to do is add the tags. Now if you have a situation where you need to create a group that's slightly different than the first, maybe we want a version of this condo that doesn't have the second window, then what we can do is we can actually select the group.
I'm going to make a copy of it. I'll just do Copy, and I'll put another version of it over here. And I'm going to keep that selected and over here on the Properties palette I'm going to click the Edit Type button. What you'll see is the groups behave a lot like other objects that we have in Revit. We can see the Type Properties here. Well, in this case there aren't any properties to manipulate, but I can duplicate and rename. So I'm going to make a duplicate of the 2 Bedroom Unit and the suggested name is 2 Bedroom Unit 2.
I'm just going to put one window here just so I know that; that's what this one is and click OK, and OK again. This is a separate instance now. So if I edit the group, I can select this window and delete it. That will not apply to these other two. If I decide later that this one should look like this one, I can now simply select it and there's my second version. When I choose it, it will remove the window from right there.
If I happen to have a tag associated with the object that I removed, for example, if I select this in Edit Group and let's just say I remove this door. Let's not talk about the fact that we have no way to get in that bedroom now. Let's go to finish, notice that the tag in the Attach Detail Group gets removed. If I select this and change it back to the original, the tag comes back again. So the Attach Detail Groups respond to the underlying model group regardless of what you do even if you're adding and removing elements.
It's a pretty powerful feature. Using groups is a great way to manage these repetitive design elements that you have in your projects. You create a series of elements, you group them together, any changes you make to one instance of the group apply across the project. You can swap in and out different versions of the group, and by using Attach Detail Groups, you can even manage the annotation and the tags that are associated with those nested model elements.
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