Only those pets already added to Collector's Bag can be placed on the workbench. That means you must first add any pet to Collector's Bag before you can extract Altered Crescerite on the workbench.
If you don't have the pet added to Collector's Bag, you will get a workbench screen like this:
You can't click on "combine" buttons, therefore you cant proceed to extracting.
You will get Altered Crescerite in your inventory from the process. Then you can right click on Altered Crescerite and add them to Currency Bag in order to be able to use them for future Pet Upgrading.
Depending on the pet rarity, you can extract:
- Common Pets - 1x Altered Crescerite
- Improved Pets - 1x Altered Crescerite
- Magic Pets - 2x Altered Crescerite
- Extraordinary Pets - 5x Altered Crescerite
- Legendary Pets - 10x Altered Crescerite
- Unique Pets - 20x Altered Crescerite