In TFVC you can merge changesets from Branch A into Branch B. Is it possible to view which changesets - specifically which ids - from Branch A were merged into Branch B?
Using the tf.exe command line tool, the merges command can provide the merge history between two branches.
So, in my example, from the source control root folder on my local machine I can run the following command in the shell of my choice tf vc merges a b /recursive to get a list of which changesets from a were included in merges to b:
Changeset Merged in Changeset Author Date
--------- ------------------- -------------------------------- ----------
20096 20292 Joey Bloggs 30/04/2018
20102 20292 Joey Bloggs 30/04/2018
20103 20292 Joey Bloggs 30/04/2018
Where the first column contains the changeset from branch a and the second column the changeset that merged it into branch b.
In order to get this working I had to add the folder location of tf.exe to my PATH variable.