Add prefix to certain values

[ccm]

Hello,
I’m trying to add a prefix to this list but only to the elements that have a value. What’s the best way to do it?
Thank you in advance

[Draxl_Andreas]

@ccm ,

use a codeblock boolean f.e.

x == "E30C" ? "_E30C" : ""

a variation

KR

Andreas

[ccm]

Thank you so much!