Hi Alex Tracadoe.
Being able to track your commissions on gas sales and the inventory of the convenience store in QuickBooks Online is crucial to keep your accounts accurate and track what has sold. I'd be happy to point you in the right direction to get this entered.
In order to pick the best account type and what to categorize them as I recommend contacting your accountant as they are trained in how to make these kinds of entries. If you don't have an accountant no worries, we can help. You can go to My Accountant>Find a pro to help to find one in your area.
If you have any questions let us know and we'd be happy to help.