How to dynamically change the "find" field in find&replace tool

[Carrot_WinWin]

Hi Team,

Would like to seek your brain on this.

I tried to build a dynamic find&replace tool. and the "find" filed is dynamically choosed from a drop-down tool. it works all good if user indeed choose one field. however, I also want to enable user to choose [None] from the drop-down. 

But if user choose [None] in drop-down. then the "find" field will be left as blank and then workflow cannot continue.. so is there anyway I can specify one column to "find" filed so when user choose [None] from drop down, the find&replace tool can keep using this specified column and continue to work?

[KGT]

If I understand correctly, you want the option to skip the Find/Replace.

You can do this by using detour/detour End, and have a radio button set.

I've attached the edited version of your workflow as well. There are changes to the order of interface tools in the interface designer.