How to edit?

Hi all, I am a Sketchup newbie. Wanted to edit this to extend the length of the sofa. I used explode to separate components but was not able to extend the base. Can anyone help with the steps and/or refer to any tutorial that can be helpful?

Sketchup model: (Sectional Sofa Leather | 3D Warehouse)

Separated version:

To help achieve your goals, some time spent at the SketchUp Campus and at the SketchUp - YouTube channel will be very worthwhile. Both sites are from the SketchUp team. On the YouTube channel, pay attention to the Square One Series. It covers the basics for each tool.

You only “exploded” one level deep. The base looks as if it consists of several elements. You may need to explode a few more levels to be able to edit the articular object.

As RLGL states time spent learning in areas he mentions will teach you to work with all Sketchup objects. That is more beneficial to you long term than just resizing this sofa.

Are you using the free web version as your profile indicates or are you using SketchUp Pro?

I have the Sketchup Pro version

Please correct your profile then. If that information is correct it makes it easier for us to help you.