Prerequisites
The machine room configuration exists.
Steps
1.) Add a record for a new DTColDwgHorTab, linked to the DTColDwgTab record. In the DTColDwgHorTab table (L_DTColDwgHorTab), add a new record. Enter the RID of the corresponding DTColDwgTab record into the DTH_DTD_RID column.
2.) Fill in the remaining horizontal drawing fields. Complete the rest of the DTColDwgHorTab record's fields for the duty table's horizontal drawing and set the correct machine room group number in DTH_DTMR_GRP (matching the machine room you prepared in the previous step).
Result
The duty table's horizontal drawing configuration is complete and correctly linked to both its drawing record and its machine room.