From Level.Name List to parameter value

I want to assign value to generic model with Element.SetParameterByName node. If i do it from Levels->Level.Name->Element.SetParameterByName it’s working. But i want to use levels from elements. I don’t know how to use list levels.

Lacing crossproduct has work coinsidently. But i don’t know how and why. I’d be appreciated if anyone explain the difference

find this picture the best explaination of lacing

study the values in the picture and it should be clear

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Thank you @stefan.gokstorp it’ looks pretty clear. im studing on it. If i stuck i’ll ask some details if it’s ok for you

no problem

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