For each dash board prompt, create corresponding saved filter and use this filter across all reports.
Are you thinking why?
Suppose you have so many pages on dashboard with common dash board prompt across all pages and each page has one report, each report has drilldown to detail reports.
In these situations many people will create filters on each and every report from scratch, even though dashboard prompts (filters) are common across all the main pages and detailed pages. In these situations using of saved filters will be more powerful, its just one time creation and reusing it in all reports.
Even it is more useful, if requirement changes frequently on dash board prompts, its just matter of changing corresponding saved filter that’s all. How cool it is :)
Here is step by step to create Saved Filter and using it in reports.
1) Go to Answers and Click on create saved filter button
2) Choose subject area
3) Choose columns and corresponding condition i.e. all dashboard prompts.
4) Save
After save look like this
5) Create a report and add this saved filter.
6) Save report.
7) Link this report and dash board prompt in Dash Board page.
8) Browse the page.
Hope you will follow this as development standard, going forward in your development.