In order to run multiple zones concurrently, you'd want to set Stack mode (Settings->Operation) to No, then schedule your programs to start at the same time.
Please be careful not to have 1 zone overlapping the same time. The best way is not to repeat the zones in your programs i.e. if program 1 has Zone 1 in it, program 2 should not.
For example:
1. Program 1 has zones 1, 3, 5, 7 on for 10 min, others 0 min.
2. Program 2 has zones 2, 4, 6, 8 on for 10 min, others 0 min.