The way of importing a component into a unit B of an existing component
There are two components build by me named JX1 and JX2, each component has 70 pins.
Now I want to build a new schematic symbol with 2 units, for example unit 1 and unit 2. Unit 1 is JX1 and unit 2 is JX2. How could I import existing component to a unit of a new component?