I'm new to KDE Neon. It works great.
(I'm from windows and ubuntu)

Calculator utility, when I type and search from application menu, i find it and start.
I want it to be part of application menu. When I go into edit applications I can define an entry.
But I can't figure out what is the command for executing calculator?
And is there a way to find it for all applications?
Thx

?? Kcalc. If it's not there, just install it. https://imgur.com/a/R5bk9kp
If you just want the occasional calculations and don't need a specific application, krunner ( and some menus ) can do it too. Otherwise, kcalc.
It has several settings and, of course, you can put it anywhere you want. https://imgur.com/a/F9NpLKC