como puedo hacer que se rellenen los datos personales con personas que ya han llamado el formulario antes

estos forms yo los utilizo para hacer diagnosticos de mis clientes. eso quiere decir que son clientes que rotan constantemente. quiero saber si hay alguna manera en la que si un cliente mio ya lleno la ficha una vez y queda guardado. cuando regrese no tenga que llenar todos sus datos personales otra vez. si no que el ponga por ejemplo su ID y que con ese id se autorellenen todos los datos personales.

Hi Jessenia,

Thanks for your patience and understanding, we appreciate it. Our Spanish Support agents are busy helping other Jotform users right now, so I'll try to help you in English using Google Translate, but you can reply in whichever language you feel comfortable using. Or, if you'd rather have support in Spanish, let us know and we can have them do that. But, it might take a while until they're available again.

Now, coming back to your question, We have a Spreadsheet to form widget widget that you can use to import your data, but it won't populate the Product List field. Let me show you how to use it:

• Create a spreadsheet that includes your data in the structure you see below. It's important that the column names in the spreadsheet and field names on the form are the same.

• In Form Builder, click on the Add Form Element menu on the left side of the page.
• Under the Widgets tab, search for the Spreadsheet to Form widget and add it to your form.

• In the Widget Settings window that opens up, upload your data file and customize the other options. 
• Then, click on Update Widget.

• In the final stage, add the fields to view values and name them the same as on the spreadsheet.

Give it a try and let us know if you need any help.