Replication of application version attribute

[fa__]

Hello,

I would like to create a custom category similar to 'software assignment' but also including an attribute that links to a configuration file for every application . As a result, I have tried to create a custom category the includes the same attributes as 'software assignment', plus an extra one to include the relationship to a file.

I do not know how to replicate the attribute that includes the application version.
I have read in the documentation about 'Browser with Subselection'. It does not seems to be the mechanism used in software assignment versions but it seems useful for my case. However, I have not been able to add this kind of attribute to a custom category. Is it possible? Is there a different way to create an attribute that references an attribute of a different object that is also been referenced?

As 'software assignment' backwards the category 'Application -> Installation', it would also be valid for me to replicate this category. In this case, I would need to create an attribute that references another attribute of the same object. I do not know how to do this either.

What is the best solution for this case?

For further reference, is it possible to explore the configuration of existing categories in the same way that object type configurations can be seen in 'Administration -> CMDB settings -> Object type configuration'?