RE: How to assign a form attribute to to a segment?
Hi Sebastian Winter,
Sorry for the omission.
As we know, the form submissions of a marketing form is recorded with a string.

Here, for example, an option called Education was submitted with one of the option values - 10000002.
And the segment can be like:

But as you can see, in the first screenshot the contact submits several different values.
So the above behaviour segment alone does not guarantee a final result, it will filter out all contacts that have been submitted with the value 10000002.
You have to add a query block after it. Here 10000002 is the value of the option label Education 03. You can check it in the properties of the option field.

The above segment allows to filter out the contacts who submitted an option field with a certain option which is the current option.