2. Dates should be stored with a Date/Time field. Even though those are just month/years, you should think about changing it to a Date/Time and then just storing the first date of the month/year (e.g. 2/1/2021, 3/1/2021, etc.). Doing that allows you to use the built-in date functions of Access (https://www.techonthenet.com/access/functions/index.php) which would make this easier.
Thanks a lot all. The crosstab query is working.
Now i was doing this also so i could create a combo graph.
What would be the trick in order to allocate last year's sales to the Primary axis and current sales to Secondary axis please?
So you can visually see the difference in sales for each month.