Omron SYSMAC CJ1W-EIP21 Operation Manual page 160

Setting Tag Data Links
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18. If you want to just add new tags and register the tag set, first register the
tags with steps 1 to 9. In this example, input tags D00004 and D00005
have been newly added.
19. When you are finished registering the required tags, click the OK Button at
the bottom of the Edit Tags Dialog Box.
20. At this point, a confirmation dialog box will be displayed to check whether
the registered tag names will be registered without changes as tag sets.
Tags are just being added in this case, so click the No Button. Just the tags
will be registered, without registering the tags as tag sets.
Section 6-2