So even though that IS tracking HP, just leave it blank? Yes. The reason is that each of your kobold tokens is pointing to the same "kobold" character sheet, so if you link Bar 1 to hp, changing the value of Bar 1 will change the hp value on the shared character sheet. You could make separate character sheets for each individual kobold ("old kobold", "crossbow kobold", "kobold in the red hat", "Fred the kobold", etc.), link each token to its own unique character sheet, and assign Bar 1 to hp for that sheet, but generally having the kobolds all share a character sheet and assigning Bar 1 to "None" is simpler and easier.