I have case type, where i collect customer information (including fields like: first name, last name, dob, phone, email), and have data named "customer" where i save all this information.

Then i have stage, where customer want know birthdays of other customer by selecting from dropdown months, which i created by myself.

So, I don't know, how to display data from that data page when user select for example April, how am i need to source my data page, if it was only "date only" type for DOB, but in dropdown list which i created i have 12 month named by myself. 

Additional information: in the stage "birthday" i created process collect info about month, with field "Month" type: picklist. In the section collect info about month, i've used new property month, with ui control pxDropdown, with table type prompt list, and typed in prompt values all 12 months, so what i should do next? Am i need configure repeating dynamic layout, if yes, how should i source info in my data page records and how validate, when user selects in this picklist some month, and i want to display him all records that includes selected month by user.