subcotracting with ME31L

Hello

[ In Sub contraccting process with Scheduling Agreement[

when we creat on e agreement with two scedule lines on 28.02.2007(qty 50) &28.03.2007(Qty 60)

so we taken as "L" Item category in ME31L when we r going to process components is it necessary to enter components in two line i means enter as 50 next line 60 or give one time as 110 qty how we will process . after that we r go for MB1C to provide material to vendor is it right or not plz expline me subcontaracting scenario in scheduling agreement

Maina