Are you skipping records in the import format or in the mappings?
If you want to skip records in mappings, you should set target value as "IGNORE". Then these records will not be exported.
You can then filter data in your grid by target value = IGNORE.
Other option would be to create a custom report which shows rows having IGNORE in any target dimension value.
Hope that clarifies
Thanks Fransisco. I will try these options.