Required mod in the mod line: BTSE_Economy

create a new empty mod (or reuse your server adjustments mod)
open the folder for BTSE_Examples and copy
lua/shared/ValuesAndPrices.lua
to your new mod under the same path
open the copied lua file and follow the comments in it
upload your mod containing the copied and adjusted price list to the workshop
load the mod containing it after BTSE_Economy

not sure on how the folder
pathway should look