Assign a BOM for batch

Hi All,

I want to assign a BOM for batch quantity. Hwo can do this dynamics NAV 2009 R2 or 2013.

Example;

user is planning to produce 100 of item A (Assume item A is a medical tablet)

NAV can assign a BOM for item A;

1. If user want to assign BOM for 100 item of A, how can do it ? (I tried UOM in BOM card, But still struggling)

2. Assume produce Qty (Batch Qty time) to time will vary. Then hwo user can assign BOM for the requirement before run MRP ?