I have a spreadsheet for a client.
It consists one worksheet of 6 pages, each representing 6 months of a 36
monthly period (inserted pagebreaks). The content refelcts hours worked per
employee and cost for their time. Employee hourly rates are different. The 6
monthly costs are subtotalled and the grand total is shown at the end.

What is the most effective way to account for many clients?
Copy and paste the next client under the first in the same worksheet or
Copy and paste into the next worksheet, (but this would limit me to 255
clients wouldn't it?).

Please advise, thanks in advance.