Assuming you have access to a 330 MCDU make a direct-to entry
(to the appropriate VOR) you will see two prompts on the upper r1 and r2 keys, type the radial on the scratchpad then line select it on either of the r1 or r2 keys. You will get a blue asterisk next to the radial you entered, select (press once more), that blue asterisk and you will be rewarded with an intercept or track out line on your nd with the word "manual" as your "to" waypoint.
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