Hi @Archy ,
What version of JMP are you using? In JMP 14, you can nest the Group X variable at top which will give you vertical lines as well as removing the bottom X axis line of showing the nesting. To nest the Group X variable, you can drag and drop to the right or to the left of the main variable (Left is nests main Group Variable within dragged variable, Right nests dragged variable within the main Group X variable).
Would this work for you?
Best,
Chris Kirchberg, M.S.2
Data Scientist, Life Sciences - Global Technical Enablement
JMP Statistical Discovery, LLC. - Denver, CO
Tel: +1-919-531-9927 ▪ Mobile: +1-303-378-7419 ▪ E-mail: chris.kirchberg@jmp.com
www.jmp.com