Working Patterns - Automatic allocation form one to the other

I have multiple clients that have multiple mostly 2 patterns at a time where the EE moves weekly from one to the other. On some clients I have 3 patterns where the EE would change 3 times each period. I.E Week 1 staff member is on Mon-Fri next period (different pattern), I need this automated so the EE moves from one to the other and this is not a manual process.