I have a column of values in Excel with numbers and text and the Month (text).
I can build my table (displays values by Month - works great), but when I try to create a chart (bar and line), the Show Me doesn't allow (grayed out)...?
what can I do (to create a chart)?
You need to create a date in Tableau using Makedate function .
Do let me know if it helps you or else could you elaborate it more so that I could help you out better .