You apparently have this relationship:
ElementaryEd::StudentID = INTASC::StudentID
Any chance you can define this calculation in INTASC instead of Elementary ED? That would be pretty simple to set up and different display techniques can be used to show this data for all subjects on an ElementaryED layout.
If not, there's another approach, but it's a lot of work to set up:
You can make as many relationships between these two tables as you need, using additional table occurrences so that the relationships can differ.
Using your example, you can define a field in ElementaryEd that contains "ED" and another with "424"--these can be data fields or calculations--which option's best depends on what you need here. Now you can create this relationship:
ElementaryEd::StudentID = INTASC 2::STudentID AND
ElementaryEd::EDField = INTASC 2::Class AND
ElementaryED::424Field = INTASC 2::Class #
To create INTASC, select it in your relationship graph and then click the button with two green plus signs.
Now you can define a calculation in ElementaryED that refers to field 1a in INTASC 2 and it will refer to the desired field.
Note: Given the complexity of adding so many additional relationships, you may want to define just two of these fields in ElementaryEd as data fields and use a script to set different values in them, calculates the values needed and then stores them in the appropriate data field in ElementaryEd.
Thanks so much for the prompt response! I think it would be possible to define the calcuation in INTASC so I will try to approach it from that angle. I really appreciate your help.