Is it possible to do this thing exactly?

[leo_flowers]

Is it possible to make it so that, when people try to press a button, sentries spawn?

[Haiasi]

(Button) Button Pressed —> (Sentry) Activate Sentry

Repeat for multiple sentries.
(Make sure the sentry is inactive on game start!)

[GimSolver]

Button Pressed → Show Sentry
or
Button Pressed → Deactivate Barrier (if you have a barrier over them)

[WolfTechnology]

yse, just place a button and a sentry, make the sentry not active in game, and place a wire from the button to the sentry, the wire must say, “When button pushed-Spawn sentry”