Store multiple strings in a variable

[S-D]

I need to have  a checkbox with string values and store multiple selected strings in a variable.

Any suggestions how to achieve that?

[Or]

Same as you would store any other text to a variable - you'll presumably want to concat() the possible values and store the resulting string.

[S-D]

And how do i get the values that are selected in the checkbox?

[Or]

Concat() or GetFieldSelections(), depending on the exact result you want to achieve.