I may be missing something here, but it sounds like you either need to create a relationship between your two tables or append them together. I am assuming that you have a separate query to import each tab of your Google Sheet?
Yes, I don't know if I should create a relationship, append fields or create a calculated columm. Because, in the near future,I'm going to add new course so I've to plan a model that can resist this changes without break the report.
This is an example:
I want fields in MKT01TN y MKT02TM feed one graph and then I can choose whit an slicer the propper course.