Update an existing row in DB in new data

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This is the issue:

  1. I try to create a cascade form - The user will fill a few fields in each slide of the slideShow.
  2. All the slideShow data need to be save under the same row in the DB (Webselenese)
  3. My problem is on function checkListAndUpdate. I can extract the correct row from the DB but i don’t know how to add extra data without fill all the old data again.

https://www.wixmeup.com/one-time-deal-test5

Oren