Hello @Heldyyyyy,
not sure about your design and exact data you have in your tables but seems to me you should use variable input/output ports on CASE Switch Start/End nodes. I have created a little example for you so you can check it out. This is workflow design:
You can now change input month in first Table Creator and different Math Formula will execute. (Month covered in Rule Engine are December, January and February.)
Workflow is attached so you can give it a try. Workflow version is 4.7.7.
ipazin_CaseSwitchExample.knwf (19.0 KB)
Br,
Ivan