[Google Sheets] How to relate teachers with subjects for courses

Hi,

I am creating a Google Sheets with two sheets:

• Teachers: The teacher's names.
• Subjects: The subjects's names.

These sheets are separately because every year a teacher can be added/deleted. The same for subjects.

Now I want to produce a table whose rows are teachers and columns subjects. This table is for each course, for example "1şA", "3şB" etc. For this I created a sheet "Teachers & Subjects".

So for each table, I want to put in each cell an "x (n)" where x indicates that the teacher teachs that subject, and n means how many hours it teachs.

I used a dynamic table but I can't edit the cells, so I don't think this is the best approach, since I required a new sheet (Teachers & Subjects).

Why a dynamic table? Because I want to add or delete existing subjects.

I upload a workbook as an example, but this must be done in Google Sheets. How can we achieve this? Thanks!