If and Vlookup
I'm new to Smartsheets and I'm trying to figure out how to do an IF([Response]3="Yes", VLookup formula linked to a reference data sheet. I've tried various ways to input and always get Unparseable. Any help is appreciated!
Comments

You have to create that reference in the little dropdown data that appears while typing in your formula. Then you will select your range and finish the formula.
See screenshot below for reference.

But my initial IF is based on a field on my current sheet then I lookup my reference sheet hours based on that answer  first true then false.

You should be able to apply the same methodology to set your vlookup... =if(x=x, Vlookup(  choose the external reference when you start typing this.
See screenshot below.

I know I'm not doing this right  LOL. Here is what I have and still not working  I feel like I'm missing the logical expression in my referenced sheet, but I'm just not sure...
=IF([Office Test Lab]1="Yes", VLOOKUP({Apexstamator Reference Data Range 2}"Lab Test Office Yes",{Apexstamator Reference Data Range 1}, 2), {Apexstamator Reference Data Range 3})

Try troubleshooting by comparing your lookup to the instructions found on the function post itself. Or the limitations as seen on the second article.
 https://help.smartsheet.com/function/vlookup.
 https://help.smartsheet.com/articles/2476606formulasreferencedatafromothersheets
Those might give you some clues as to how you should set it up.
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