remove the location select and instead allow the customer to enter the location

hello and thank you for this wonderful plugin this is the second time that I use it in one of my site. I work on a boiutique and for the moment I am local I must have a site where there are about ten products to sell since we have people who buy stock from us and we resell them without putting them forward. is a question of appointing each one and allowing them to have a stock therefore at the level of the places on the plugin we put people. the problem is that we do not sell products without the seller code so the seller makes sense to give him his code to destock these products instead of the selecte we want to put an empty input and allow the customer to enter the seller code and then make the purchase with. how to modify the select la and put an empty input. cordially.