FBA shipment: Choose category: No Prep Needed

Hi all
Does anyone know how to work around a time consuming job I have to do for every FBA shipment. Basically when going through the process and I come to ‘Prepare Products’ all the products that are liquids, granular and small are already there from previous shipments but when it comes to products that are ‘No Prep Needed’ I have to manually choose the category, no prep needed even though I’ve shipped the same products countless times.
I can’t help thinking there is somewhere that I can check a box once and for all as no prep needed for each product?
Thanks in advance.