How to control IDOC processing in XI

hi

I have scenario where File --> XI --> IDOC

Source structure

Header 1...1

Detail 0..unbounded

Trailer 1..1

For every detail i need to generate 1 doc

My requirement is that i dont want to send all the IDOCs at one shot from XI.

trfc connection should be open just once for all the IDOCs and not single IDOCs are posted.

Is there any transaction from where i can control my IDOC processing.

Need urgent help.

Thanks ,

Loveena