1. Rotate yellow beam to face west
2. Enter blue portal
3. Drag west pillar down so it meets yellow beam
4. Rotate blue beam to face south
5. Enter yellow portal
6. Move yellow beam up and right, then rotate to face east
7. Enter blue portal
8. Enter yellow portal
9. Move south pillar out of the way of the cyan beam, then renter yellow portal
10. Move red beam out of the way
Now you have cyan portal in center. Repeat similar concept to get the northern cyan beam facing east on the pillar that leads out.
Thanx for your great help. I did get stuck at no. 8 cause the solution was too "easy" for me. But i managed in the end. With your hard work the rest was easy.
1. Rotate yellow beam to face west
2. Enter blue portal
3. Drag west pillar down so it meets yellow beam
4. Rotate blue beam to face south
5. Enter yellow portal
6. Move yellow beam up and right, then rotate to face east
7. Enter blue portal
7a. Rotate center yellow beam north
8. Enter yellow portal
9. Move south pillar out of the way of the cyan beam, then renter yellow portal
10. Move red beam out of the way
11. Rotate center yellow beam west and enter blue portal
12. Rotate southwest yellow beam north and move to middle, then enter blue portal
13. Rotate center yellow beam north and enter yellow portal
14. Move west blue beam north and rotate it north, then enter yellow portal
15. Enter blue portal and rotate green beam east, then reenter blue portal
16. Enter green portal and move cyan beam middle and rotate it east, then enter green portal
17. Enter cyan portal
18. Done!