We do not use an attribute that contains a Line Number or Find Number. That said, we would love to have the ability to assign a Eng. Item # via the Parameters in an assembly, without that Eng. Item # sticking with that specific part in other assemblies. So, a Eng. Item # that doesn't have to be set in a table, but doesn't make it past the assembly. Primary reason....we use a lot of Combined States, and with those you can't have the table with the fixed EIN's work in more than one sheet. Assigning those numbers in Parameters would allow us to import the on screen parts list with the EIN's already established.
Hope that makes sense.