Superscripts

Is there a way with the Keyman board to enter super and sub scripts? As a physicist I need them for equations.

There is no way to do that if it is using formatting to super- or sub- script a character.
If you are using the encoded characters that are super- or subscript you can do that.

What do you mean by " encoded characters that are super- or subscript you can do that"?

There are many superscript and subscript modifier letters that are encoded.
For example, some of the Latin script letters are here: https://www.unicode.org/charts/PDF/U1D00.pdf

Also, there are superscript and subscript digits encoded: https://www.unicode.org/charts/PDF/U2070.pdf

However, if you are wanting this for equations I really think you need formatting and should not be using these encoded forms of superscript and subscript.

There are super-script like versions of a number of characters within the sil_ipa keyboard, with subscripts solely for the numbers.

That said, especially within the realm of physics, I’d recommend something like LaTeX for mathematical formula formatting. I know MS Office’s Word has a half-decent equation editor that’s more easily approachable than LaTeX, if that’d be preferable.

What and where is the sil_ipa keyboard?

https://keyman.com/keyboards/sil_ipa

Note, the keyboard help documentation for sil_ipa has the following for typing
Superscripts and
Subscripts

Numerals should be covered, but likely not all the letters you’re looking for.
A text editor will be more equipped for typing formulas.

I installed the sil̠ipa, wnt to options and configrations, but don’t find BEFORE, as indicated.

Right click on the little Keyman icon in the taskbar and select Configuration (right side).
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Then, under keyboard layouts, select the IPA keyboard:

Click on Keyboard options…
That’s when you get this menu:
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It’s only available if you have the keyboard selected.
Hope this helps.