only one MRP run for diffrent companies plants

Hi PP expert,

my bizness scenario is . there 2 companies code one company code has 2 plant and another comp has 3 plant..only one product is assembling in all plant. suppose finish material X is producing in all company plants

but finish material X have component K and L, L is manufacturing in only one plant and supply to all company plant

my client want to produce material component "L" for all plants for his monthly requirement with MRP run.

component L is semi finish material and its is component of X

but i am not under standing how will get requirement from same company plants and other company plants. for Monthly MRP run

Kindly suggest me how will take requirement from others companies plants for MRP run...

kindly suggest me step by step

Regards

Aqueel