What Can We Do For You?

Yes, We have the option to show the button "Hold for additional info" on the approval page of PR, PO and Invoice. 

Go to setup > General Tab > More info visible in > select the toggle where you want to enable the "Hold for additional info" button. Once enabled then the button can be seen on the respective page. 

Yes, We can change the product category code from the setup. 

Go to > setup > General Tab > Product Category Code Format > and enter the category code prefix here. Once category code saved in the setup then automatically it will come while creating the product category.