you are almost there…!
Assuming your pile family has got a parameter “PileLength” you’d just duplicate the SetParameterByName node, and change the parameter name from “Mark” to “PileLength”
It looks like you are using GetItemAtIndex =11 for the value
You need to read what the error says, and then adjust the input as needed. We do not have a clue what your error is indicating.
EG if the parameter storage type is a string then you need to put in a string not a number.
Then similar the other way if it requires a number but you put in a string.