Question again about something with combinethreshold and splitthreshold

I see this address EjbyurGcWxiEt18LY1NRhpPWnWU5SP9kJk on the blockchain link below and notice it is staking a 10750 for 250 and it auto combining into a 11000 stack. How do you do this? Assume I have the same amount as this address.

https://chainz.cryptoid.info/hbn/address.dws?EjbyurGcWxiEt18LY1NRhpPWnWU5SP9kJk.htm