Startup Idea: All-in-One Expense and Shopping Software for Virtual & Personal Assisting

Startup idea to create an integrated system for personal assistants working in the virtual space. The software should be able to consolidate different receipt and savings information from numerous grocery and retail stores, link all this to a customizable household budget spreadsheet and deduct expenses automatically from net allocations as customers shop. The objective is to assist frugal families to manage their shopping budgets directly and efficiently.

The industry that I am working in is Virtual & Personal Assisting. One of the services that I am trying to offer is for the frugal minded families (this would also be launched on a future website and be a paid service option for participants. I would consider paying for this software to be created and customized. It would likely be a huge asset to my business and well received feature to new clients!

I am struggling with finding an "all in one" system that lists the major grocery and retail stores in our area, can highlight the sales / coupon match-ups for that store for the week, direct links for coupon downloads (or e-coupons to load directly to related store cards) ... and now for the unusual part that I'm having problems with ... I want it to link directly to a personalized household budget spreadsheet!

Basically the concept is to have a monthly spreadsheet that the participant can create and then have them be able to manage their grocery costs directly from that same site. Example: A person creates a spreadsheet for June 2016. They enter that their grocery budget for the month is $500. The go to the coupon & sales match-up area and click on every item they plan to purchase for the week. They go shopping, come home and scan in the coupon receipt on to the system and it would be automatically deducted from the grocery line item on their budget spreadsheet. Since they spent $100 at the store, the new budget line would read $400 available. It would be a constant check to keep your budget in line monthly. I feel like there has to be a way to create this type of all inclusive system.