After positioning an ID number entity, additional ones can be aligned in a chain.
These additional ID numbers behave as sub-entities subordinate to the original ID number in the chain. Only the text of these sub ID numbers may be edited.
Sub ID numbers may be dragged and positioned anywhere on the screen.
The remaining sub ID numbers realign themselves accordingly. When dragged they are detached from the original chain and become main ID numbers.
Main ID numbers may be fully edited with all modifications applied to the sub-ID numbers.