Creating Logic
Before you begin, make sure that you activate the Logic features by clicking on the Logic button.
Adding Controller
Click on the Add Controller button
Select the String data type as illustrated above
Defining Behaviour
Click on the Add Behaviour button
Select the Conditional as a Behaviour as displayed above
Creating Conditional Actions
Select a group you want to affect by Condition Action from the Group section (in our case, it is Light Transform).
Then:
Select the Condition as the Equal
Define an Input Value
Drag & drop your Group to the Conditional Actions panel
Repeat the same process for different conditions and adjust the values
Select the Else condition
Drag & drop your Group to the Conditional Actions panel
Optionally define new property values
Deleting a single item from any section (Controller, Behaviour, etc.) sometimes crashes the Unreal Engine. For this issue, please refer to https://issues.unrealengine.com/
Workaround: You can remove all items and then add them again.