Command : S3d_Attach
This command allows you to weld one or more parts to a main part.
To add parts to an assembly you first need to select the sub parts (P1 and P2) and then the main part (P3).
Welded sub parts will receive a blue or green color by default (in Sub types visibility mode).
This allows you to see immediately which parts are welded.
All parts of each welded assembly are merged together into one selection group.
This means that if you select one part then all parts of that assembly will automatically be selected.
This behaviour can be disabled (so you can switch between part selection and assembly selection).
To learn more about this see Assembly/Part selection switch.
Note: A plate cannot be used as a main part to weld other parts to it. Only profiles can be main parts.