If your waypoint is on the radial, you can program the FMS to follow the reciprocal radial into the fix, which is easier to understand in the FMGC and also this way you will avoid creating a discontiunity.
Task: After departure (Heading 360) turn right and intercept "VOR" radial 040 to "INTRS".
Solution:
1) on F-PLN A select DCT "INTRS" radial in 220, preferably do not execute (Thales FMGS),
2) Dial 070 heading on FCU before take-off. This will preclude automatic NAV when airborne, and keep your chosen intercept heading ready.
Once in the air, observe active lateral navigation mode RWY TRK. Climb straight ahead as required, then pull heading to turn for intercept. Then execute the direct to your waypoint with radial in, and confirm NAV blue. Monitor intercept with raw data "VOR" R040 on pilot monitoring side.
cheers,
FD.