Hello! I need help urgently. How can I add data to a collection in another collection? From the scheme presented below, I want to demonstrate my problem. On the page of my site there are windows № 1,2, the data of which displays data from the collection №1. On the same page, there is a window No. 3,4 for entering data into the collection No. 2. This data is entered manually, this is the date and quantity. Direct arrows indicate the connections, and the curved arrows indicate the direction in which the data should be saved.
The problem is that I can not save all the data in one collection because I can not save the data connected to another collection by clicking on the save button. And I need that in the collection number 2 were brought simultaneously all the data displayed in the field number 1,2,3,4. I will be grateful for any help, thanks !!!