Here is a G major scale as we would normally play it.
Now here is a G major cross stringing scale.
I am playing the same notes but on different strings. I am also using open strings. The object is to let the notes ring together a bit. I find it easier to start playing the scale backwards. Here is the G cross stringing scale forwards.
Now that you have the basic idea let’s learn a couple others. Here is a C Major cross string scale. First backwards.
Now the C Major cross stringing scale forwards
How about a D Major cross string scale backwards
And now forwards