You can melt the remaining wax and combine all the candles, then repour it with a new wick.
Rosann....They can be melted and remolded. Use mason jars, empty candle jars...anything that will hold the hot wax. Buy wick at craft store and cut to length you need. Wrap the wick around a pencil and rest on the holder until it dries. Good luck
14 ideas here:
My husband takes the old scented candles and puts them in his truck of his car. The smell permeates thru the entire care, especially in the summer. Smells Great!
Clever ideas here:
There are lots of ideas here on repurposing old candles and also candle jars:
You can melt them and reuse them again.
This is a good tutorial on how to re use candles: https://m.youtube.com/watch?v=TmsKTLd7wpA
This is another tutorial: https://m.youtube.com/watch?v=z1W27JMWe3A