How do I activate all Membership Levels immediately and for the full length of the subscription?

I have five different subscription plans. I want to have three access levels - A, B, and C. Two of these subscription plans can have multiple levels. I want all those levels to be enabled for the entire length of subscription. All the documentation and movies show that someone will graduate to each of the levels over time. Is it possible to enable several access levels at once for a finite subscription plan? Below is a description of the subscription plans and associated levels.

For subscription plan 4 - enable levels A & B
For subscription plan 5 - enable levels A, B, & C

The other subscription plans are straightforward:
For subscription plan 1 - enable level A
For subscription plan 2 - enable level B
For subscription plan 3 - enable level C

Thank you!