That would be done in the Inventory Feature of Samba. Take a look at these Threads…
The above should give you all the info you need . There are several ways to go about setting that up however it really depends on your needs and how you sell. If it were me I’d set a product for each liquor and add a portion for each size bottle in addition to a poured drink (single and double.) I do inventory by the Ounce and have created a system outside of Samba to do my inventory counts so that works for me. You may do it by the bottle, so you’ll have to adjust to accommodate that.
Hopefully all of that made sense. There’s a clear difference in terminology but I think I’m understanding what you need to do.