A breakdown source is defined as a set of records from a table or database view or as a bucket group. Multiple breakdowns can use the same breakdown source.
Breakdown sources specify which unique values, called breakdown elements, a breakdown contains.
Breakdown source records have a related list that lists the breakdowns that are based on that source. You can create a breakdown by selecting the ‘New’ button while in this list. The list works like the Indicators list on indicator source records.
Other options in this question do not exist on the breakdown source form.
After you create breakdowns that use this source, these breakdowns are listed in the Breakdowns tab.
Here are the available related lists on the baseline configuration when navigating to the Formula Indicators form: Breakdowns, Contributing Indicators, Time series exclusions, Targets, Thresholds, and Diagnostic Results.
‘Signals’ is not an out-of-the-box related list on the Formula Indicators form.
Use the Contributing indicators related list to navigate to the indicators used in the formula or their indicator sources. If you include another formula indicator in the formula, both that indicator and its contributing indicators are listed.