Do you know, that… ?

If you need to create a copy of a part in an assembly – you can do it easily. Just drag the component from CTRL from the graphics window or the action tree (same as files in Windows).

It really is, if you drag the part behind a cylindrical face with CTRL and drop it near another face – the constraint will be added automatically coaxial!

This solution is also effective for copying a component from one window to another – that is, from one file to another.