sod_order_category flag is stored in shp_hist table in shp_order_category field. This is used for Pro/Plus performance reports.
Which Mfg/pro version you are using ?
socrshp.p is responsible program to create the shp_hist table. But i think this will only create when you are using the PRo/Plus module. Please verify if you have installed pro/Plus in your verion.
I think socrshp.p is introduced after version eB S4 , and you cannot find it in prior version.
This field only used in performance calculation , so this is not stoed in ih_hist.
As i suggested you should have Pro/Plus module installed in your Mfg/Pro .
This also requires whole setup of parameters based on performance criteria decided between you and your customers. You can get the documentation of Pro/Plus module in QAD knowledgebase.
Once Pro/Plus is activated your system automatically creates the shp_hist table to record the performance . Recording is done through various shipment transaction screens (i.e. Shipper confirm ,7.9.15 etc) .I think your system doesn't have pro/Plus activated thus shp_hist is not showing any record.