You can remove fitment from your listings in bulk. All you need is a list of Item ID's.
Simply use the file attached as a template. Then paste in the desired Item ID's starting on row 2, leave the first cell "item_id" as is.
Go to the Uploads page in myFitment
Click 'Choose File' and select your file then click 'Upload File'
Then select 'Fitment Remover' under the File Type drop down menu and Click 'Create Upload'
The progress of this action will be under the 'Previous Uploads' tab.