Assuming you don’t want to break out the individual cells (i.e. you only want a 9V output) just reuse the connectors from one of the 2xAA parts. The following tutorials may also help
Edit:
Since as I recall the battery holders are all bendable legs, in breadboard you want to make a pair of square pads with no fill and no stroke put them on the end of the connectors and call them connector0pin and connector1pin. Then in the fzp file (unzip the fzpz file and you will get a .fzp file and 3 or 4 svg files) you need to delete the legId in the connector xml like this:
<connector type="male" id="connector0" name="Pin 0">
<description>Pin0</description>
<views>
<breadboardView>
<p svgId="connector0pin" layer="breadboard" legId="connector0leg"/>
</breadboardView>
needs to change to this:
<connector type="male" id="connector0" name="Pin 0">
<description>Pin0</description>
<views>
<breadboardView>
<p svgId="connector0pin" layer="breadboard"/>
</breadboardView>
the parts editor should be able to deal with creating the connectors from there (it can’t deal with bendable legs though!)
Peter