I am trying to add new input field in sales > order > invoice
. This would be like my reference number. This custom input field should be show in sales > order >invoice
& sales > invoice
& when print invoice this custom field need to get showed , New custom grid need to get added , I am currently working with this :
Can some one let me know how i need to proceed for this .
Custom field in admin panel should look like this : https://i.sstatic.net/BaEbb.jpg