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it's what i mean 

thanks for the answer
i want to break a user story in some tasks to do to get the aceptance criteria defined by me.
so in a column called "tasks" i can put a list of things to do (maybe the technical owner has to do that) and why not, checkbox them as "in progress", "completed", etc...
Hi Matthew

my advice: i can choose a color and affect a caption. When i mouse hover on the user story it can display the caption as a tooltip or something like this ;-)