Hi,
I have done data entry in my previous agencies too where I had to keep a financial record of the clients and vendors alike. This would include Estimate numbers, purchase orders, release of payment, any deadlines that have been missed along with project details, vendor name etc.
I had learnt excel and Microsoft Office in school and since then I've been using it for most of my professional life. Not just data entry but making it easier for the viewer to sort and filter data as per proper headings, using functions that would help in calculating, etc.
We can discuss this in furthur detail if everything works for you! Hope to work with you soon.
Thanks!
Anamika