The item descriptions are stored in desc resources.
Desc 3000-3511 are used for item descs, (ie, 3000+Index number, or 3000+RID-128).
Index numbers are the resource ID # of the outfit minus 128.
To change a desc in EVNEW, make a plugin that has a desc resource of the appropriate ID. So if you wanted to change the desc of the hail chaingun (RID 155) to describe how it was made by Joebob's Gunz and Stuff, you would make a plugin and create a desc with ID 3027 and enter your new desc. Creating descs for new items is done similarly (Though of course the desc can go in the same plugin as the outfit).
If you just want to modify an existing desc, like adding "This particular unit was made by Joebob's Gunz and Stuff" to the end, you would want to open the nova data file in one instance of EVNEW and copy and paste desc 3027 (or whatever the appropriate one is), and then modify it as you wish.
Look in the desc section of the bible for more information and the IDs for other descs.
-Az
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