It would help if you could post a screen shot, but I assume that you mean the blank lines at the bottom of the grid edit form.
Those are there to allow users to create new records in Grid Edit mode. But in your use case, you do not want to allow those users to be able to add records, so take away the Permission to add records to the child tables, and you should not see the extra blank lines at the bottom of the grid edit tables. The Automation will still run OK as it runs under the Permissions of the owner of the Automation (you).
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Mark Shnier (YQC)
Quick Base Solution Provider
Your Quick Base Coach
http://QuickBaseCoach.commark.shnier@gmail.com
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