In a two-day Yom Tov in the diaspora, is it permissible to light two Yom Tov candles on Yom Tov Rishon, one of which is a 24-hour candle, and then, on Yom Tov Sheini, to light two Yom Tov candles for Yom Tov Sheini from that 24-hour candle that was lit for Yom Tov Rishon? Similarly, is it permissible to light Yom Tov candles from someone else's Yom Tov candles on Yom Tov?
Although it is prohibited to light a regular candle from the Shabbos/Yom Tov candles, it is permitted to light a נר של מצוה. However, one must be careful to only light directly from the Shabbos/Yom Tov candles to each other; lighting a match or splint to carry over the flame is prohibited (as this doesn't constitute נר של מצוה). (SHU"A)