[nlmacdonald]

Make sure that you use the same custom ability section on your archetype as Sorcerer. The bloodtypes for Sorcerers are populated under the primary custom ability section.

Then select the "Allow Custom Abilities..." button. Scroll through all of the options to the Sorcerer (cHelpSor). Check this option. It should connect the Sorcerer resources to this Custom Abilities section.

Also, ensure that the custom ability count button has been selected and beside the level 0 section on the matrix place the value 1. When you exit there should be a "x1" beside the button.

This should do the job for you.

If you existing class already has custom abilities, you'd need to use a custom ability section not used by that class. For example, the Wizard uses primary, secondary, tertiary section and for this value you'd have to choose quarternary or quintenary.

You'd have to copy and alter the blood type you'd be using and ensure you set the ability section to the area you choose on the archetype. For example, if you choose quintenary from the Wizard example, you need to align the Custom Ability you've copied to that section.