Time sheet that can draw from one spreadsheet, add a value, and add to a different spreadsheet.

I am not sure exactly what I am looking for. I am a super beginner in excel. Think middle school in 2008 kind of beginner. I am trying to help with building a time sheet that will allow us to have one spreadsheet that will have job numbers and the people who have been assigned to the job and take that into another spreadsheet that will add numbers based on the job. eg, Job A is worth 12 hours, Job B is worth 3 hours. I feel as though I may be entirely out of my depth with this and am more than willing to admit defeat before we even begin, but figured I would reach out to the internet before giving in so early. Thank you all for reading.