@Christian1
If there will be just one excel for each eazyBI account and there is just one sprint in account you are reporting about, your file can stay as it is and you could map the data to “Time” dimension when importing additional measures from the excel file.
Then you could create a calculated measure that returns the “values” from imported file using the “Sprint” defaultmember.
But I would recommend using also a “Sprint” column in your file and then map this column to “Sprint” dimension members to associate new imported measures with a particular sprint - the same sprint you are selecting in the report.
See one additional data import use-case here:
Martins / eazyBI support