In leave request of Time management from ESS, we used customer field for some of custom requirement. Like for Half day leave. First Half FH or second SH.
For the same we can use SAP provide Customer Fields of PTREQ_ATTABSDATA. Considering scenario as customer wants FH and SH from field help.
It can be done .
Please refer the attachment to achieve the same.
Let me know if further details required.