I own pe basic and my machine lets me resize designs.... i have an ellageo. I think the problem is that the PE 150 is pretty limited in what it can do. So resizing would have to be done with additional software.... and that means tons of money. But on the good side, PE150 is a great starter machine but I eventually sold mine ( on ebay) with no loss and was able to buy a more sophisticated machine that took the same bobbins neeedles and feet as my brother PC 6000. SOmetimes I wish I had two machines again ... so I could sew on one and embroider on the other but it took up a lot of space and I had less flexibility because each machine had fewer features than the very expensive combos.

Did you view the video that came with your machine. I was looking at mine the other day and they have a whole section of how to sew out a design larger than the 4x4 field. I have an OESD magic box that reads all manufacturer cards that I can transfer to my PE-150 plus I got extra software to use to edit colors, resize, etc. that I paid $249 that has repaid itself many times over.

Many times if you read the operation manual (link below for PE Basic), it will answer many questions.

http://www.simplicitysewing.com/ftp/whitepapers/SmartBox_Manual.pdf

Here is a link that might be useful: PED basic operation manual