Create New Financial dimension with x++ in axapta

DimensionStorage dimensionStorage;
DimensionAttribute deparmentDimensionAttribute;
DimensionAttributeValue newDepartmentValue;
// Find the deparment dimension attribute
deparmentDimensionAttribute = DimensionAttribute::findByName("Department");  
// Find the new department value we want to put in the new combination.
newDepartmentValue = DimensionAttributeValue::findByDimensionAttributeAndValue(deparmentDimensionAttribute, "abc");
// Load a DimensionStorage instance with the old combination and update the first segment with new value
dimensionStorage = DimensionStorage::findById(ledgerTable.LedgerDimension);
dimensionStorage.setSegment(1,DimensionStorageSegment::constructFromValue("abc", newDepartmentValue));
ledgerJournalTrans.LedgerDimension = dimensionStorage.save();