Don't see the need for any Save button.
#This script creates a new record in Reviews linked to the current record on the Surveys layout
Set Variable [$SurveyID ; value: Surveys::SurveyID ]
Go to Layout [Reviews (Reviews)]
Set Field [Reviews::SurveyID ; $SurveyID ]
Go to Layout [original layout]
You can omit the last step if you want to stay on the Reviews layout.
It is also possible to do this without any script if you use a portal to Reviews on the Survey layout to create review records. This would require enabling "allow creation of records via this relationship" for the Reviews table.
I'm assuming I can use an auto-entered Create Date from the Reviews table to identify Surveys that have not been Reviewed yet.
Perhaps it would be simpler just to perform an "omit" find with an * entered into the Reviews::SurveyID field. That would omit all survey records with at least one linked Reviews record.
You may find it helpful to redesign your tables into a much more flexible format even though it will complicate the import process if you do. Here's a thread that discusses the tables and relationships that might be defined for a survey: Need aid on generating a report from a survey layout.