I'm sorry, I can give you no further help. Again, if you look at table normalisation, you will see that if the same piece if Alpha data (ProjectName), the database is not normalised, and you will run into trouble. The way you have set out your table the ProjectName will appear once for each beneficiary, so what happens when the Project name is unintentionally mistyped. "ProjectABC" is not the same as "Project ABC", so your Combo box may show "Fred" as the beneficiary in "ProjectABC" and "John" in "Project ABC". I know what you are trying to do id type in "ProjecxtABC" and see both Fred & John's names. It won't work.
You need a main form for the Project, and a linked continuous Subform for all the Beneficiaries.
I can't find anything very close to what you need, but here is an image of the closest thing I have got.
So wherever you see the word "Interest", use Project, and where you see the "Member", think Beneficiary.
I am sorry not to help further, but if the underlying structure of your database is wrong, it is not my policy to encourage you to proceed further, as we may solve this particular problem, and you will be back in a few weeks with another problem caused by a non-normalised database.
Phil