Merging Activities

When seeding we use 3 products at once. Once it comes over from my john Deere, it is down as 3 separate activities. I have been merging them together so that the fertilizer is added under the seed activity. This helps the report show that 1 equipment and operator cost is covering all 3 activities. It would be nice to be able to do this from the activities page by clicking the 3 boxes that are relevant and merging them together. This would help speed up the editing of the activities report and eliminate human error.