Use Modify|Merge from 2 Sources to merge changes between two different merge sources (URLs) to the selected file/directory.
Changes are merged from one Repository between From and To to the local Destination. The last 10 merge sources will be stored and can be set using the drop-down button beside the Repository drop-down list. For details regarding the Advanced options, refer to Merge.
Most merging use cases are covered by Merge and if possible this command should be used instead.