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Usage guidance, also known as a tag wiki excerpt, is a short blurb that describes when and why a tag should be used on this site specifically.
Each rule consists of multiple rule entries that specify exactly how the leads or cases are assigned. For example, your standard case assignment rule may have two entries: cases with “Type equals Gold” are assigned to “Gold Service” queue, and cases with “Type equals Silver” are assigned to “Silver Service” queue.
To create an assignment rule, from Setup, enter Assignment Rules in the Quick Find box, then select Lead Assignment Rules or Case Assignment Rules.