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Please check Active link "CHG:CRQ:FunctionCopyChange_100". It calls active Link guide: "CHG:CRQ:CopyChangeGuide".
Basically OOTB field data is stored in 'z1D Copy' fields and then below run process is used to copy this data to new change request:
"PERFORM-ACTION-SEND-EVENT @ COPYTICKET "" + ";FormName=CHG:Infrastructure Change"
So you need to create 'Z1D Copy' fields for your custom fields as well and update the existing workflows in the guide mentioned above.