If the Select Expert, choose "New" and then the field you want to use (in this case {payment.pmt_eff_dte})
using the dropdown, select "is in the period", then select 'Aged0to30Days'
Click the 'Show Formula' button, then the 'Formula Editor' button.
Locate the line you just added (it should be "{{payment.pmt_eff_dte} in Aged0to30Days"
Place a parenthesis before the table/field, put an 'OR' after the Aged0to30Days. add the table/field again, and after it type 'in Aged31to60Days OR' add table/field again 'in Aged61to90days')
So when you are done it should look like this:
(
{payment.pmt_eff_dte} in Aged0to30Days
OR
{payment.pmt_eff_dte} in Aged31to60Days
OR
{payment.pmt_eff_dte} in Aged61to90Days
)
By keeping it in the parenthesis, as above, you can continue to add other selection criteria outside the parenthesis.