Hi Eric,
There is an existing post that you might already read. communities.bentley.com/.../how-do-i-add-custom-fields-in-the-datasheet-field-list.aspx
From this post:
DOC_REG: All Tags will have this option to pull the Document Information.
INSTR: This is the Tag Register table for Instruments. All others will show TAG_REG.
View [AT_INST]: This is the AT_ System Query that works with the AT_INST Tag_Type. This will be different for each Tag_Type.
STREAM: This is shown for all Tag_Type Datasheets. It allows the user to add any related Stream information.
PROJECT.INI: This allows the user to add any values that are stored in the Project.ini such as Client Information, Project Descriptions, etc.
This is all hard-coded and added on the fly via core code. This cannot be modified.
Regards,
Artiom