It looks like you've already defined the schematic symbol as a three terminal device. You can link any three terminal footprint to that symbol by double clicking on the schematic symbol, bringing up the symbol properties, and selecting the desired footprint in the bottom right dialog box.
If the schematic is not yours, and you're asking how to make the schematic symbol in Altium Designer - you need make it to look like the one in the schematic you posted. You can't just do a "snapshot" because the pins are electrical objects. You'll have to place three pins in the schematic library editor, and then draw in the remaining parts of the symbol using lines. You can then place the three pin component in your schematic, and link it to the proper PCB footprint.
When you compile the schematic, and import it into the blank PCB, the software will pull the linked footprint from the PCB library and place it on the blank board.
A component is defined by its pins as they appear in the schematic symbol. The rest of the symbol is just a drawing to make the symbol mean more to the person reading the schematic. If you make the symbol with three pins, you have a three pin device no matter how much more "stuff" you draw connected to those three pins.