Sometimes when making device entries, I make an entry that is meant to be a sub connection, but I make it as a device entry under a company/site instead of the device it is a sub connection as. I would like to be able to drag the sub connection I made into the device and have it list as a sub connection; sort of like how a folder can be dragged and made as a sub folder to another.
This has been on our todo list for while but has not been implemented. I will add a note to our todo. For now you can use the refactoring actions to parent or unparent a sub connection.