Purchase Plus currently doesn't have a report that will show you the total value of a Stock Transfer in the Inventory module.
However, one way in which you can accomplish this is to export the transfer and work out the total value using the CSV file.
To do this, navigate to [Inventory], [Transfers]
Find and click on the Stock Transfer you want to export
Click on the [Export] button in the bottom-left of the screen
Download and open the export in Excel or another platform that supports CSV files
From here, you should be able to find the SUM of all the individual transfer items by either selecting all the lines in the "Total Value" column or by using a formula. For example: =SUM(G2:G9)
The SUM formula will add all the values together from a selected cell range.
Find out more about the SUM function here.