it seems this is out of the box functionality for catalog variables of type select box with the price set on the question choice.

steps:

· Go to catalog item

· add a variable delivery location (create a variable of type select box with options 'home', 'office')

· Update the ‘home’ option (question choice) so that it contains a price:

· Go to the catalog item in service portal,

· note the price

· Now scroll down and select ‘home’ delivery – notice the price is now displayed:

· Note the refreshed price:

(and watch it go back to £164 if you change it back to office)

· Note the price on the RITM once checked out: