Hi,
As you have not mentioned which reporting tool,so i assume that is actuate which we are also using.From actuate 9 version you can also choose
multiple selection parameters,so when you create an parameter for choosing the Time period (Look up - Type) where an nsql query is written to show all the time periods.when user choose an multiple parameters the internal id of the time periods chosen will be passed in to the sql procedure.i have enclosed the snapshots for your reference.
cheers,
sundar