This will check if 'AcmeAnvils' is one of the possible values of ClientName and evaluate to TRUE if yes
substringcount( concat( distinct ClientName ,'-') , 'AcmeAnvils' )
This will check if only one ClientName is selected and the ClientName is 'AcmeAnvils' and evaluate to TRUE if yes
getselectedcount(ClientName) = 1 and only(ClientName) = 'AcmeAnvils'
Thanks! Can you also confirm the Properties tab and field in Chart Type Straight Table that I would place this expression in? When I put the second expression in the calculation condition on the general tab, it makes the data inside the straight table appear and disappear. I am hoping for something that will make the table object itself appear and disappear. (Starting to suspect I'll need to go up into sheet properties or triggers or something now, but hoping for a show conditional checkbox and expression place somewhere inside the object still.)