Would it be possible to do a filter that excludes items that have a % of Device = 100%? Anything that has only one part will meet that criteria.
1) You can filter on the distinct count of the Parts dimension and set it to only keep devices where have COUNTD(Parts) > 1. Or you can built a flag.
COUNTD(Parts) > 1. Drag that to the filters shelf. Keep 'True'.
2) you can use a table calculation drag Value to the rows shelf, right click, and then click on add table calc. You want % of total. Compute using Pane Down.
If you want to send a mock workbook, I'll step you through it.