How to change charge cavity

I am terribly sorry but I am not sure what you are asking. It is possibly a language barrier, if English is not your first language, but that is no reason to not try and help you.

Are you referring to the battery? Or perhaps the charging port?

(Examples using a different device just to help communication.)

Example of a battery change: Reemplazo de la batería del Samsung Galaxy S10e

Example of a charging port change: Reemplazo del puerto USB-C y la placa de carga del Samsung Galaxy S22

If it is something else, please clarify.

@erelectronics sounds like they mean the charge port