What is the best way to pass some parameter from one form to another form?

Lets say I want to pass from Item Form of some catalogue some input value that I select manually to Selection Form of another catalogue that I open when select manually another element on the same form.

Hi Peter,

if I understand correctly, you want to do something like in the screenshot?

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Download scr_1.png (20.28 KB)

I need to pass Attribute1 to Selection form of Attribute2 which is of type Catalog3

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Download pic1.png (21.46 KB)

Here's the solution

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Download pic2.png (103.56 KB)