Are you thinking on a single sheet to list everyone's leave requests and remaining entitlement?
I would make it simple and use a tab for each member of staff.
Having said that, I was a civil servant for decades til a few year ago and we used spreadsheets for all sorts but staff noted their leave periods on individual clerical A5 sheets which their managers initialed to agree them.
Why do you want to include petty cash details on an annual leave spreadsheet?