How to create worksheet template - NOT workbook template

Hi,

I have a workbook containing multiple worksheets attached. At the end of each month I want to create a new worksheet using a template so that formulas etc are transferred to a new sheet but all other other sheets remain the same, the idea being that I can add 'June', 'July' etc as time goes by. Saving as a .xlt in the templates folder is not what I'm after as this opens up a whole workbook, overwriting the other tabs. Ideally I want to right click a tab at the bottom, select 'Insert' and open up a template, rename it for the appropriate month, without this effecting the other tabs in any way.

How can I do this?

Thanks,

Will