Hey Barbara...I'm sorry to hear about your Perilla losing some limbs. Luckily, many plants can be easily propagated vegetatively (that just means that they can reproduce without having to resort to producing seeds). Perilla isn't all that different too (there is one thing about Perilla that is different, but I'll explain that later). You can make what are called herbaceous, or softwood, cuttings. This time of year probably isn't the best to be making such cuttings, but if you have a fairly sunny spot indoors that is protected from cold it might be perfect for this. You will also want to get some rooting compound for this. Most garden centers will have rooting compound. I usually go for the powdered compounds. They're fairly easy to use.