Exchange Sales Order - How are people doing exchange in NetSuite? I don't think there is any native functionality that allows, I also need to check for less or more expensive when exchanging.

The the way I've seen this done previously is as a return -> credit -> new sales order -> apply credit. This is maybe not your exact use case, but it neatly side-steps the amount comparison issue (or at least pushes managing that challenge down to the support reps/accounting folks).

Yeah we need to link the two sales order and auto compare so we take the manual process out

I mean I think ultimately you're going to have to credit/refund the original SO and apply something to the new SO for proper accounting, no? Linking the two SOs shouldn't be that much difficulty, you could probably do it just via custom fields. If you want it all to be automated/non-manual, it's totally doable via scripting, but that's where it gets to be a larger project.

Yeah, I am thinking of suitelet to compare two items and if it respects customer preference then create sales order in edit mode with item selected already and old sales order number in a separate custom field