Pmax Question · PPC Launchpad

Pmax Question

Google limits the number of each listing group to 1,000 ids. I wonder how many ids should be added to a new campaign in order to make it work well. We have totally 30,000 item ids in GMC. But only 20% of them have cost. Considering about the limit budge of $300 each day, how can I distribute my budge to each campaign, while at the same time can make goog use of our products?

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