HI @PandiyanK6809

You can use Append and Map to method in data transform. Loop through DEF pagelist and set each property to respective properties in ABC pagelist using <LAST>. Because if you are setting directly whole pagelist will get overrided with new pagelist.

Thanks and Regards

Hemalatha Sura

@PandiyanK6809

You need to get index of DEF(Page List) from which you need to get the values...

For getting index of pagelist you can use pega OOTB when condition @IndexInPageListWhen("When Rule Name","Page List Name")

For Example - @IndexInPageListWhen("IsValidOffice",.DEF())

IsValidOffice when rule condition = .office=DFG && .Landmark=XCV (When Rule should be in your page list page definition class)

In Data Transform please follow the below steps 

Step 1 -> Set = Param.LocationIndex = @IndexInPageListWhen("IsValidOffice",.DEF())

Step 2 -> Param.LocationIndex >"0"

Step 3 -> ABC(1).office = DEF(Param.LocationIndex).office

Step 4 -> ABC(1).Landmark = DEF(Param.LocationIndex).Landmark 

By using the above logic instead of hardcoding ABC(1) -> ABC list index, dynamically you can have your logic to find index and then you can copy the values without overriding any existing values in ABC list..