If you have created a seed task then you can edit it at any time by using the edit function to change any of the parameters, such as TGW, average seed rate or plant target, germination, overlap or even included fields.
If you exported the files to a shapefile, after you have edited your task, re-export the shapefiles for transfer to your GPS. Make sure you transfer the new files to your device not the previous ones!
If you exported the files to iSOYL, before saving your seed task you will need to change the ‘Use exported values’ on the right from ‘Yes’ to ’No’ by clicking on it and unticking the tick box. It should then display as ‘No’. Only fields with ‘Use exported values’ checkbox set to ‘No’ will have their new values changed and then exported, but the task totals and targets will take into account all fields in the task.
Save your task and then download to iSOYL in the usual way.