Adjustable chart series points

Hello

I regularly use charts in my job to scan for any anomolies in my data sets. When I see an anomoly in the data I will then return to the source data and adjust in order to normalise the set. Instead of returning to the source data I thought it would great to simply click on the series point on the chart and drag up or down. This action would then update the data set.

Has anybody seen this type of add in for Excel?

Thanks

Jeeeze. Been using it for years and never knew..

Cheers oldchippy