Filtering chart using buttons

I'm trying to filter series on a line chart using option buttons but option buttons only allow me to have one selected at a time.

sounds like you don't want to select one option at time ? you want to select one ones go in and out?
in which case you are after CHECKBOX ?

one way of doing what you asked for using OPTION button

the group of buttons control are linked to cell A80
which controls A81 which is now series Name and cells B81:H81 which is now your Y series Data

Checkbox control would require a different way of thinking

see attached example using CHECKBOX

deleted all except the 4 which i have re-mapped

if you want all of series you will need to map all the series

it should be easy to follow