Require stacked filters on grouping for Uptime report

We have a requirement that we need to filter the report more granularly on Grouping.

Use case:

If we select the report for bussiness workflow 'W' and it has 100 devices, we need to further filter it more based on Site, so out of those 100 devices, I need devices that have site 'S' so it is further filtered to let's say 70 devices and further we need to filter it with category, so out of these 70 devices, we need to filter it on Category 'C', so it is filtered to let's say 40 devices. Now the UPtime of these 40 devices is showing in the report.