This is both advice on how to do something and a UX bug report.
In Paragraph Styles and in the Tabs panel, there is a Repeat button. It allows you to repeat tabs at a regular interval.
The obvious way to do this is to set a tab, make sure it's selected, and press the Repeat button to specify the interval at which to Repeat.
>BUZZZZZ< USER INPUT ERROR #3.14159
When you try to do this, the Repeat button is greyed out. You'll have to spend some time searching this forum to figure out why.
Sorry, that isn't the way it works, even though it's likely the way most people will try to do it; it was the way I tried to do it.
Instead, you have to insert a tab, then insert a SECOND similar type of tab at the interval you want to use for the repeat interval, say one pica; and then and only then click the (now no longer greyed out) Repeat button.
Alan Cooper, the UX guru, calls this following the coders' implementation model rather than the user's mental model.
Adobe, the way to fix this is to allow people to insert a single tab, or select an existing tab, and then click Repeat, and ask for the interval at which to repeat; certainly after the user clicks the Repeat button you could say "insert tab on ruler at desired interval or enter interval: [ ]".
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