How to do a one-off bonus payment pay run outside of normal pay cycle?

Hi there we ran our normal fortnightly payroll this Weds 8th May and next one is due 22nd May.  Meantime I have been instructed to make end of year bonus payments to all employees and would like to do this now rather than have to wait until the next payrun.

When I go to set up the pay for the bonus it is asking for the pay period and I am unsure what to enter/how to go about this.  There does not seem to be an option to select for a one off payroll that does not relate to a specific pay period.  Can anybody help/advise please?

Many thanks!