You want to move it to the outdoor enclosure? If yes then just dig it out with some of the soil stuck to the roots, dig a hole in the enclosure, plant it there, water for a good start and you are ready.
I just cut it and feed it to the tortoises. If left where the plant first took root, they will usually keep growing back again and again for multiple harvests.
To propagate, I let them go to seed and then put the seeds where I want more of that plant. I have mallow growing all over the ranch now from this practice.