So you have to cut in the Open Office a picture
- Insert the image into Open Office using the Copy & Paste or via "Insert" > "picture".
- Click the image with the right mouse button and from the context menu select "picture...".
- Here you can Crop the image in the tab "" on all sides to adjust and press "Ok" to crop.

Open Office: image cropping
Tip: you can also copy images from PDF files and later Open Office crop. For more Infos you can find here.