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Unfortunately, there's no option to add sub labels on the check boxes.
You could add a "Hover Text" to assist or inform your users.
However, there are ways on how to aesthetically add sub labels on your check boxes.
Method 1: Simply add it directly in the label name and use some HTML tags. Below is a screenshot of my example, I basically just added <br><sub>(Select One)</sub>
Press enter, this is how it looks like:
Please do note that if you edit that label the HTML tags will be stripped out.
Method 2: You'll see custom CSS code. Here's an example:
content : "\A(Select One)";
white-space: pre !important;
font-size: 11px !important;
#label_33:after is basically the ID for the label "Not To Exceed Parts Cost" and we want to add the sub label after it.
content: "\A(Select One)" is used to denote an end of the line and you need to add the text here.
white-space: pre is to move the content to the next line
font-size: 11px is to make it more like a sub label font size
Here's a screenshot on how I added it in my Form Designer Tool:
This is how it looks like when you use the custom CSS code:
You just need to basically change the label ID and the attribute content in my CSS code, and everything should work correctly like a sub label text.
Let us know if you need more help on this.