Gravity forms store data based on the blog database table prefix,
in multisite, all sites use the same database, but the data is separated based on the table prefix, the prefix is โโsomething like wp_1_, wp_2_, wp_3 _.....
if you have a site, for example my.blog1.com with the table prefix, wp_1_, the gravity form stores all records of the form my.blog1.com in wp_1_rg_lead, wp_1_rg_lead_detail, wp_1_rg_lead_detail_long,
Now, if you want to save this data in your parent installation, you need to play with the database and change the severity using hooks like gform_pre_submission or gform_after_submission
This post may help http://www.endocreative.com/save-gravity-forms-data-custom-database-table/
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