No, Else does not mean OR.. (see second example for using OR)
in your case, the script steps could look like :
If [ Field A = "blue"] Go to layout ["blue-page"] Else If [ Field A = "red"] Go to layout ["red-page"] End If
basically, if the field contains blue, then go to the blue page, otherwise check if the field contains red.. etc
Using OR you would do something like :
If [ Field A = "blue" OR Field A = "red"] Go to layout ["red-or-blue-page"] Else If [ Field A = "green"] Go to layout ["green-page"] Else Go to layout ["basic-page"] End If
if the field contains blue or red, then go to the red-blue page, otherwise check if the field contains green, if it does contain green go to the green page, otherwise none of your criteria was matched, so just go to the basic page.
If your field stored the name or number of the desired layout, you wouldn't even need an IF statement.
You could then use Go To Layout [Table::Field] after selecting either Layout name by calculation or layout number by calculation.
That reduces this entire script to a single line.