Not a problem, this should be easy enough to do (and needs the first part in order to work anyway). I did wonder if you wanted both of them 
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Edit:
OK, if you have downloaded the original Sony_Spresense.fzpz file please delete it and replace it with this one. The pins are mislabeled in the original one and (I hope, because I don’t have boards) corrected here.
Sony_Spresense.fzpz (22.4 KB)
And here is the extension board with the above daughter board installed. Note that you can (as you can in the real world) connect to the daughter board connectors. This isn’t however a good idea because there are level translators connected to the same pins from the extension board. http://forum.fritzing.org/
Sony Spresense ext board.fzpz (49.4 KB)
Peter