WS21500001 leave approval how to get second level in Worklow

Dear Freinds,

I wanted to extend to second level the first level . Till now iam able to execute through ESS for first level for the WS21500001.

However of doing second level i have copied WS21500001 to custom WS900XXXXX. But i wanted to know what are the steps i have to add in the WS900xxxxx .

thanks & regards

ravi