Calculating actual production cost for FG

Hi Experts,

We have a situation where one finished product is manufactured from various semi finished materials & those semi finished material with some other semi finished mat's. For each SFG we are having seperate production order, now we have a problem while calculating actual cost of finished product because cost of each semifinished material is being calculated seperately in each production order we are not able to arrive at actual cost of final finished product, if any one come across similar situation earlier pls help in this regard.

Thanks & Regards

Sushant