PowerPoint powerpoint and VBA help

[VBA user]

so i need help and thought that someone out there might offer -
i am preparing a PPT and want to have active buttons for selections (specifically numbers)
when selected these will display in text box on the same slide - but summed.

so -

a list of selections/choices
that can be toggled on and off

and a total or summation text box that updates as the choices are toggled on and off.

any help is welcomed

Thanks