We need to start enforcing a minimum order value by category - not quantity minimum, but total order value for a specific category.
Because we don't drop ship these, some of our products are relatively inexpensive and the cost of shipping, handling, etc to us, exceeds the profit on one of our product lines.
Any suggestions on code or a place to start? Cart or catalog rules don't work because they won't allow us to stop an order that won't meet minimums.
For this you need to do changes in frontend (Knockoutjs files and templates) .
Also I suggest use "sales_order_place_before" to halt the order generation process and throw an error in a observer.
So have you find any accurate answer for your problem ??