Com Order Offline load. Holding order lines

We perform an offline load for all our COM orders. 

Under certain circumstances we would like to be able to place an order 
line on hold during this upload process so that someone can take the time 
to review what this customer actually requires for this order line then 
manually release it.

As the COM offline load is unattended (job scheduler entry) I need to find 
where to mark the order line as held in the offline load files (is there a 
flag or do I need to place an entry in a file) during the load.

I have looked at MBG9CPP - the item line offline load file but there is 
only a credit hold flag and this is not what we require

Can anyone please help?

Many thanks in advace

Best Regards

Iain Wilson