Scenario:
Table 1, Column 1:
BMW
Audi
VW
Table 2, Column 1:
Porsche
Mercedes
Toyota
Table 3, Column 1:
BMW
Audi
VW
Porsche
Mercedes
Toyota
Not necessarily in that order. Simply what was first entered in Table 1 or Table 2.
Is it possible that what you enter in Table 1, column 1 or Table 2, column 1 is automatically inserted into Table 3, column 1?
Dear @DeWi
Its not exactly clear what you want to accomplish in the long run to my opinion, as to my opinion it will be much more easy to have in Table 3, all selectable instances listed and Table1 and Table2 to read the optional instances from Table3 and when you get a new instance to add it on to Table3 from where it can be selected in both tables.
For some inspiration you could use the method as explained in the video below: