How to update the custom Sales Price of Opportunity via CSV Import?

Hi,

We often have repeated line items on our opportunity records, due to regularly using NetSuite item groups which repeat the same lines on opportunities. We calculate the sell price of our items from the cost price, adding a percentage mark up. NetSuite seems to hate the fact that we do both of these things. It seems to want us to use the sell price levels/groups and never repeat the same line item on an opportunity.

For some of our larger opportunities (100 line items plus), sales are currently spending hours going down the item list line by line, calculating the mark up (off netsuite because netsuite can't do it for them), then manually re-inputting the sell price back into NetSuite. All quoting/estimating is done off NetSuite so this seems like a futile exercise.