Create a gate model program for multiple projects

I think you may want to try the CopyMasterDetail button. Create one project as your template, add all the related detail records or in your case the Gate details. Then you'll have a button to create a copy which will make the parent and add all the related gate details automatically. I used this on an app but use custom script to do it automatically when a new record is created.
https://yqc.quickbase.com/user-assistance/copy_master_detail.html