to disconnect a table from the rest of the model, you can use multiple techniques, like the QUALIFY statement
Qualify statement adds on the loaded fields the name of the table.
==> on your model, you will have fields named like this: TableA.field1, TableA.field2
using this, no chance to have fields sharing the same name with other fields from other tables, resulting to a disconnected table.
and for a section access using different fields, read this: