You have an item let us call it A, under A there are item revisions like A-1 and A-2 and so on...
Under a item revision there are possible datasets, drawings, excell sheet etc.
Which each CAN contain a couple of attributes. The 3 lines of text of your titleblock are attributes linked to a item revision A-2 for ex. So you can have different annotations (text notes) per item revision. They also have nothing to do with the attributes of the item itself (in the most cases) (if the need is there you can link them)
The item A is also called an object (or ID), and it has a name and a description. These are also attributes and are (in TCE9) DB_PART_NO for the item itself DB_PART_NAME for the name and DB_PART_DESC for, you guessed it, the description.
As Tom stated if you change the description of an item you could get something like : A-"this is the description"
Now for your question about the link , if you create your own attributes for the note lines, you can have as many as you like and they will be synchronised with TC as you save your part, synchronised with the part-revision, because if you link them with the item itself then these descriptions will be the same for each item revision you create.
Best regards,
Michäël.
NX4.0.4.2 MP10 / TCE 9.1.3.8_build_0711 / NX6.0.2.8 / NX7.0.0.9
Belgium