Show only records related to another module

Hello,

First of all, I'm using SugarCRM CE 6.5.24

I've created a custom module, called "Time Sheet", it has the following fields:

Accounts and Project are "relate" fields. My question is, how to show projects that are related to the selected account (I added a One-to-Many relationship between [Account] and [Project].

Is it required to also make the Account and Project field not only "relate" type, but to add a relationship between respective modules?

Thank you!