Hello
How can I create a new worksheet template?
so that it opens automatically when I create a new file?

for your reply in advance thanks!

Wrote

How can I create a new worksheet template?
so that it opens automatically when I create a new file?

When you create a new work sheet, you can include all the stuff
you need from another mother work sheet.
Genfit Algo Include Test fetches all what it needs from "Include"

Genfit Algo Include.sm (16 KiB) downloaded 46 time(s).
Genfit Algo Include Test.sm (16 KiB) downloaded 42 time(s).

... this one is a more advanced Genfit Companion.

Genfit Minimize Include.sm (31 KiB) downloaded 40 time(s).
Genfit Minimize Include Test.sm (45 KiB) downloaded 40 time(s).

thank you very much Jean Giraud!
I know how wonderful SMath is, and I know how to use Run () and Include () utilities.

What I ask is easier
I mean a default custom template that includes a header and footer

that when you click on a new file (from the menu ---> File / new) there will not be a blank sheet, but the specified custom template and it will take it by default

Can be done?

Wrote

I mean a default custom template that includes a header and footer

By default, Smath has header [document & Windows official time stamp]
By default, footer page 1/X.
You can pass to me the hard print for QA your sheet rev.3
Nothing else is needed.

... BTW, your invented template has no legal value: Court case closed.

What you can have instead is a 'cartouche'.
As a company proprietary c/w logo, it has legal value.

Template Cartouche CREATE.sm (53 KiB) downloaded 83 time(s).

thank you very much Jean
your help is always invaluable