Custom Number Sequence

Hi expert, i have question about Creating number Seq,

basically i want to create custom number seq with following format for Check number , i.e

Company name-Site-1, (Where 1 is starting point) how to do this!

Requirement is that we are going to implement online payment check for vendors, so we want to have unique number on check that we can trace our check easily …

plz guide,

Have a look at how the check numbers are generated in AX, \Classes\CustVendCheque