If you want Line annotation as Diagonal line appear as shortdot style then navigate to Customize → Advanced ->Annotation 1 → Shape Options and update the Dash Style
You’re on the right track! At step 4, you just need to update two properties Of Series 1:
Set Column C as the Value
Set Column A as the Label
From your screenshot, it looks like you’ve correctly selected Column C as the value. Now, simply close the Value dropdown and select Column A for the label.
When I click on the down arrow for Series 1, I don’t have the option to choose a value and label. it just give me the option to choose a different column for series 1
Did you follow the exact steps I mentioned from 1 to 4, or did you make any other changes along the way? On my end, both options are appearing as expected.
You can try an alternative approach:You can try another way first try 1 to 3 steps, then move to step 5 first remove series 2