various worksheet updates

[app1dmk]

I have a very large workbook with various worksheets. I need to data into a cell in one worksheet and have it update another worksheet. Would that be a formula?

[FDibbins]

short answer - yes, probably

edit: if you give more detail in your question, you will probably get more detail in your answer

[app1dmk]

One large spreadsheet (2000 rows) about 25 columns.
In those column's I enter dates, data etc. In another other worksheets within that spreadsheet I have to "tally" number of occurrences of a date or action.

Right now I'm tallying the occurrences by using COUNTIF then "typing" in the answer in the other worksheet. I'd rather it tally itself in the other worksheet without having to go and type it.

Hope this makes sense.

[FDibbins]

Suggest you upload a small (clean) sample workbook (not a pic) of what you are working with, and what your expected outcome would look like.