1-Create terrain 2-Go to terrain editor 3-raise resolution (I often use 512) 4-In Editing Tool panel, click New 5-Then select fractal type, then holding down Shift key, click fractal type button-accept (OK) 6-In main display, edit terrain to liking (here I increased height Y axis) 7-Make copy and paste 8-Hold down Shift key and hit right arrow (east) key 8 times 9-Hold down Alt (nudge) key and hit left arrow (west) key 2 times. 10-with second terrain still selected go back to terrain editor 11-In editing tools panel fractal type click on East then holding down Shift key, click fractal type button-accept 12-Copy second terrain and paste 13- Hold down Shift key and hit down arrow (south) key 8 times 14- Hold down Alt key and hit up arrow (north) key 2 times 15-repeat steps10-11 but this time click South then holding down Shift key, click fractal type button-accept 16- Copy third terrain and paste 17- Hold down Shift key and hit left arrow (west) key 8 times 18- Hold down Alt key and hit right arrow (east) key 2 times. 19- with third terrain still selected go back to terrain editor 20- In editing tools panel fractal type click on West then holding down Shift key, click fractal type button-accept

This completes this set of tiled terrain.
Points:
Make copy of the terrain just created
Hold down Shift key and hit arrow keys 8 times for large movement
Hold down Alt key and hit arrow keys 2 times for nudge back to align terrains.
Right arrow=east
Down arrow=south
Left arrow=west
Up arrow=north
Hold down Shift and click fractal type button after selecting tile direction

Gosh, I hope this helps! LOL