Yes, it'll be necessary to enter those expenses in the proper categories that they belong to.
For example, if all your Wal-Mart purchases were for pens, paper, and water bottles for the office...you'd want to lump those expenses into the "Supplies Expense" or as an "Office Expense", or also, all your receipts for business meals (and entertainment) need to have their own category because the IRS treats that particular expense differently (meals and entertainment expense is only allowed at a rate of 50% of actual cost, but remember to enter the total into Turbo Tax and let the software handle the limitations).
