Item count when placing order

Hi QMcKay, thanks for the quick reply.

so it’s similar to the tutorial [Tracking number of persons][1] …

Only for this I should make two rules, one for incrementing, another for decrementing count when orders are added or cancelled. … OK, this much I understood yesterday after going through the tutorial. But with this method I get a new button on the left on the main POS screen. I don’t want this, how can I hide it?

Also, what kind of action type should I create for this rule? I tried this >>

Any help appreciated,
Thanks[1]: Tracking Number of Persons