What you want to do is have the Database name (not the label) of the field in the CMDB and then map some value from the object in Discovery that you're trying to send over. The Taxonomy defines what these fields and objects are called.
To find this, in your appliance, go to Administration -> View Taxonomy
Then search for the thing you're trying to synchronize. You may need to write a couple of sync patterns or use traversals since you're trying to access values from a few different object types in BMC Discovery. There are example patterns here https://communities.bmc.com/community/bmcdn/discovery/pages/patterns
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Starting from the taxonomy is the wrong place.
What are you trying to represent? For example the current mappings use BMC_IPEndpoint to represent IP addresses. If you really want to add IPAddress to BMC_ComputerSystem how are you going to pick which IPs if there are more than two?