I have discussed with my team and they have recommended below points for better inventory management. Hope you can facilitate as below from next dispatch. Please let us know you feedback.
Box size NW 32.4 KG which is 36 packages for both the quality of thread TXPA & TXPC
The PP belt would be two different color outside of the carton.
Specifically mention the TXPA & TXPC in tally tag.
There would be a sticker outside of the carton mentioning TXPA or TXPC.