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This could be an indication that the soil remains too moist. These shrubs can get quite large, so it will not appreciate being kept in such a small container. I would recommend potting up to a slightly larger size.

These articles will help you to care for your Schefflera:

https://www.gardeningknowhow.com/houseplants/schefflera

It is probably being overwatered. Make sure to let the soil dry out between waterings. Also give it bright, but indirect light. They also need humidity.

Here are more care tips:

https://www.gardeningknowhow.com/houseplants/pachira-money-tree/growing-money-tree-houseplant.htm

https://www.gardeningknowhow.com/houseplants/hpgen/raise-humidity-for-houseplants.htm

This is, likely, an indoor specimen. Being so, you can repot at at time, but Spring is best according to its natural rhythm. Any time that you do, just go up an inch or two on all sides with your larger container. Anything larger than that will leave it susceptible to rot.

https://www.gardeningknowhow.com/houseplants/schefflera/repotting-schefflera-plants.htm

https://www.gardeningknowhow.com/houseplants/schefflera

Schefflera are very easy to start from cuttings. The rooting hormone is not needed, unless you already have some.

https://www.gardeningknowhow.com/houseplants/schefflera/schefflera-plant-cuttings.htm

I would, actually, remove the entire branch that is lopsided somewhat close to the base. It's outward direction makes it permanently lopsided. Rotating during the winter can counteract this in the future. Otherwise, prune the rest of it for bushiness when you have to. These shrubs will tolerate very heavy pruning (I have to hack mine to pieces every few years.) Indoors, this can be done at any time. Just keep the wound clean after.

As far as propagation goes- these can be propagated at anytime indoors. It is going to be the same process as any other plant. Technically, you can take cuttings from just a small sample of tissue, but the best results without a sterile setting will be the tip of some shoots. As suggested, just cut these down to just a few inches.

You can attempt to cut the stem into pieces down to the base, but these don't root as readily as the tips.

https://www.gardeningknowhow.com/houseplants/schefflera/schefflera-plant-pruning.htm

https://www.gardeningknowhow.com/houseplants/schefflera/schefflera-plant-cuttings.htm