MRP for Sub items

I have a scenario where in

Component -A

Component -B

Component-C

Needs to be planned together and requirement will have to be created only for Component A.

Example -

Component A - Stock available-10

Component B- Stock Available-8

Component C- Stock Available-8

Requirement for Component A is 40. MRP should check stock for B and C and create procurement proposal for 14. Can Alternative item group functionality be used for this and if yes how priority and usage needs to be given?