I am looking for something, where my clients could login into form and they will not have to fill everything

Hello, I am looking for something, where my clients could login into form and they will not have to fill everything. I mean like company name etc. 

Its for my order form.

We do not have a membership feature here in JotForm wherein your users can log in or log out.

However, we do have a Spreadsheet to Form widget. This widget allows you to upload your spreadsheet to your form and use the values you have on the spreadsheet to pre-populate your form. Please refer to this user guide: How-to-Use-the-Spreadsheet-to-Form-Widget.

Hope that helps. If you have any questions, let us know. Thank you.