CAUTION:this isnt legitimate, it uses editing of save file.

open supermarket simulator and press esc then save then quit to main menu. from the main menu, quit the game.
press windows key + r at the same time (or press windows key and type run) then type in %appdata% press enter then it will open file manager. click on app data on the top next to roaming. Open the folder titled locallow. find nokta games and open the folder. open supermarket simulator then open(preferably notepad) every file until you find one thats a script(first thing you should see is } but idk if its different for every save.)make sure its the latest one thats a script then scroll till you see "money" ONLY edit the number and nothing else. Open the game then check if youve gotten the cash, if yes then congrats, you did it. it no then add a reply to this guide, ill respond to it and try to help.(MAKE SURE TO SAVE YOUR NOTEPAD)

follow the money guide until the bit when they change the amount of money.

Scroll down until you see 'current store level' then change the NUMBER to whatever level you want to be. you can also edit anything else down there if you want to, just do it carefully as your save file could get corrupted.make sure to SAVE the changes once done editing. then open the game and check if your level is the one you want it to be, if its not then retry the guide. send a reply if you need help, ill try to answer.