Alternative raw material

Hi All,

I have a query. I am procuring raw material from two source. One is a indigenous material and another is a import material. both are operational. How can i use these two materials in my Parent BOM? I know that to create a alternate BOM 1 for Indigenous and Alternate BOM for Import material. Then i need to create a Production Version. I need to select options in MRP 4 of the material master of the Parent Material. During converting Planned orders to Production Orders, system will ask which alternate BOM I need. Here i need to select manually. but i don't want to do this manual work. I want automatically selection of the BOM 1 or 2. So could anyone let me know any solution for my query?

Regards,

Sangeetha