Not going to lie, I couldn't really explain everything you will have to know
to pull this off... and access has a fairly steep learning curve. And
depending on how in depth and how you generate these numbers, it could be a
really long process.
Are you planning on having people input data from access forms? If so what
kind of data is it? Are the actuals generated from timesheets or do you just
plug in large sum numbers? Things like this you need to figure out before
starting in access, then you need to figure out how relational databases
work, then once you get to the point of being comfortable with dealing with
the tables you will need to figure out everything dealing with form inputs to
edits.
Once you get a hang of this then you can get in to creating queries and
reports which creates a whole new learning curve.
So it depends on how extreme you want to take it. If it is as simple as 2
tables in which you just go in to the table and manually put in the numbers
and you don't have to much inputs, then you can just work on building basic
queries and reports.
Best of luck to ya!