How to create a custom payroll balance dimension

We're trying to add a custom balanced dimension to payroll balance definition

for example, from February to the end of the calendar year (FEB YTD)or from March till the end of the calendar year (MAR YTD)

We know that we can use the time definition, but we're not sure how to link it to the balance payroll dimension. Any help would be appreciated

Rgds,

elie