If you have a true pool/spa combo, the pool and spa each have their own sets for suction and return lines. The valve actuator should sit on the valve that splits them.
In Pool Mode or Spa Fill mode, the actuator should close the spa side suction.
In Spa Mode or Spa Drain, the actuator should open the Spa Suction which closes the Pool Suction.
On the return side, you have an actuator to open/close the spa and pool returns. The Pool return side may be further divided to pool returns and In-Floor system if the In-Floor systems isn't on another pump of it's own, in which case, it would have it's own suction, separate from the the pool/spa pump's suction sets. Without a pic or two of your equipment pad and a description of the lines in the pics, I can't be more specific. There isn't enough info yet.
Scott