TestExecute: How to choose which tests are run

From my understanding, when you run the a project with TestExecute it simply runs what is specified in the Execution Plan.

Is there a way to change the Execution Plan within TestExecute? I would like if other members of my team could run smaller portions of my test suite to ensure functionality in certain areas without needing to run the entire 20hr+ test suite.

This is possible by creating many git branches of each of those different portions, then my team members would pull that respective branch. But this would be VERY cumbersome to initiate and even moreso to keep updated with any new tests.