SVP ! aide pour créer une application excel VBA .

Good evening to all
A year ago I created a spreadsheet to manage my computer store a workbook that contains the daily operations
by combining a film for each month and each film (months) there records revenues and expenses day by day and that was the end of the month I set formulas to calculate totals for revenue and expenditure
now being left the country I can not control daily operations and sales and what embette me most is that I can not check As a measure if the formulas which I have not created have not been hacked because when I do the accounts at the end of each month I strongly noted that between the figures recorded on the spreadsheet and the amounts actually realized there was a huge gap suddenly I n ' comes more to check the profitability of my shop
that's why I come to you because I wanted to do - a vba excel application to give / remove formulas change law and that each employee can only enter data in the boxes intended for it (for exp : assuming X work in the morning , so it can ONLY enter receipts morning and it can not touch noon box or evening, as he can not change the rules for calculations.
I put attached a screenshot of what I did on vba and workbook that has cmmencer for the month of January to better understand ...
and I ask the same time if it is possible to create a kind of connection interface to limit unauthorized access and prevent anyone can access the data .
I started by creating the connection interface and so on vba interface to enter data for each time of day (morning, afternoon , and evening) but I do not know how to make the connection between excel and vba
I would be very grateful