Do you have a sample workbook to share? The two sheets of an excel workbook will appear as tables in Tableau. The linking value here for a Join appears to be the field [Div] but to determine what's possible we need to see how dates are represented in the data. is the data really just the text Q1 and Q4? If so, then a calculated field will be needed to turn these into dates.
Providing a workbook with the sample data would help to assist you.