Dogwood what you are looking for are "Modules" the difference with sketch up is that they have to be edited as a separate file instead of within the project.
In SKetchUp they are called "Components" not groups.
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Basic Procedure is:
1. Select items in Floor Plan
2. File-> External Content-> Save Selection as Module
3. Uncheck "Replace Selection with Hotlinked Moduel"
4. Named it and save were AC can find it, it will behave like XRefs
5. Use File-> External Content->Place Hotlink Module to place the first copy
6. Copy as needed
To Edit
1. Edit the original items that were used to create the module
2. Resave using previous steps overwriting the Mod file
3. Use Hotlink Manager to update the other copies.
Eduardo Rolón AIA NCARB
AC27 US/INT -> AC08Macbook Pro M1 Max 64GB ram, OS X 10.XX latest
another Moderator