The pot size will limit how large your plumeria can grow. Your pot will also need drainage holes on the bottom so that water doesn’t pool on the bottom and rot your cutting.  Even if you plan on transplanting the plumeria outdoors, you should start the cutting in a pot indoors. Each plumeria cutting will need a separate pot. Look for a potting soil that is labeled as fast-draining online or at a gardening store. Thoroughly mix the perlite and potting soil together so that they are well incorporated. Fill the pot 1 inch (2.5 cm) from the brim to give the cutting enough medium to grow in and to prevent overflow when you water. Fast-draining potting mix will prevent mold and fungus from forming on your cutting. The water that you put in the pot should drain out of its drainage holes on the bottom. If the water doesn’t drain, you’ll need to use a lighter, more porous potting mixture. If you want, you can add 1 part vermiculite to the potting mixture to aid with drainage. While not necessary, root growth hormone will help initial roots grow from your cutting. You can purchase powdered rooting hormone online or at a gardening store. Dip the cut end of the cutting into a cup of water first, then dip it into the root growth hormone powder so that 1–2 inches (2.5–5.1 cm) of the cutting is covered in the powder. Dipping the cutting in water first will help the growth powder stick to your cutting. Push the cut end of the cutting into the soil in the center of the pot. Add more potting mix to the top of the soil to help hold the cutting in place. Pack the soil down around the cutting to make sure that it doesn't move or shift as the roots grow. Pushing the cutting 3–4 inches (7.6–10.2 cm) into the soil will give the roots enough room to grow. to support large cuttings. If your cutting is too large and falling over, you can use a stake to keep it straight in the pot. Plant a stake deep into the soil in the pot. Then, attach the stake to the cutting with wire or string. This will help hold the cutting in place as the roots...

TL;DR in Vietnamese:
Dùng chậu trồng cây dung tích 4 lít hoặc to hơn cho mỗi đoạn cây. Đổ vào chậu 2 phần đá trân châu và 1 phần đất trồng cây có độ thoát nước nhanh. Tưới nước cho ẩm đất. Nhúng đầu cắt của đoạn cành cây vào hoóc môn sinh trưởng, nếu muốn. Cắm đoạn cành cây vào đất trong chậu sâu khoảng 7,5 – 10 cm. Cắm cọc để chống đỡ cho các đoạn cành to. Đặt chậu cây ở nơi ấm áp và chờ cành đâm rễ.