Is empty
Is null
It's simplified to a single operator. Using "Equal to" with no value specified covers both cases automatically.
Is not empty
Is not null
Same as the above answer; use the "Not equal to" with no value specified covers both cases.
Like
Use "Contains" or "Does not contain" as needed.
How do you enter the values. Seperate by commas or pipe "|"?
There's nothing special to do for the contains operators. They are just a LIKE usage. To compare against multiple values you use the "Is one of" using a comma to separate multiple values which does an IN or NOT IN query.
What about filtering fields with multiselect?
You'll want to use the contains operator in this case.
Do you have a link to a manual? That would also help.
See the CB 2.0 Primer Book and the videos below.
www.youtube.com/playlist?list=PLp0puRITgC7PuyzPsMUECDI46VE7IFSAX