根据您的要求，您可以使用级联下拉列表对InfoPath进行此操作.

或者，您可以使用JavaScript代码来做到这一点.

有一个有关级联下拉列表的博客，您可以参考它:

https://parallelmindsblog.com/2012/12/17/cascading-drop-down-list-in-sharepoint-2010/

谢谢

Wendy

I have three lists: Vendor, Course and Session.  Vendors deliver courses in multiple sessions throughout the year.  Using Sharepoint 2013, I am using lookup fields to associate the Vendor to a course and then a course to one or more sessions.

In the Session list, however, I am entering the Vendor's Company Name manually.  I want to figure out how in the Session List View, Display form and Edit Form (optional) I can get the Vendor's Company Name to auto-populate after I select the Course Title with the lookup control.  This could even be populated only after saving the form. See the diagram below:

My constraints include that I am not a SP administrator and don't have SharePoint Designer Access.  My toolset is pretty limited to forms created in InfoPath and/or Nintex. 

Thanks

Hi,

For your requirement, you can use cascading drop-down lists to do that with InfoPath.

Or, you can use JavaScript code to do that.

There is a blog about cascading drop-down list, you can refer to it:

https://parallelmindsblog.com/2012/12/17/cascading-drop-down-list-in-sharepoint-2010/

Thanks,

Wendy