Groups are a number of elements which, when they change in one group, change in all.
General concepts
- Elements with hosts and their hosts must be on the group.
- Walls must be not attached for better height adjustment.

- Wall ends must not automatically join other walls outside the group.
- Be careful with elements with different reference levels in the same group, they will be problematic if the levels don't change together.
- It is possible to attach detail groups such as dimensions or labels.
- To correct a group, save it under the name .rvt and try to understand the problem.