What are the ways to select symbols using jsfl?

Suppose I have a symbol my, and I copy two copies, both of which come from the symbol my. Now I can find the current symbol I selected through the symbol my in the library, but I cannot select the symbol my copy1 or my copy2.
For multiple copies of symbol my, is there a way for jsfl to find and select cpoy1 or cpoy2?
In addition, I did not layer these three symbols. They were all placed on one layer. I wanted to find copies of them to edit, which was very difficult.
I think if you layer the symbol you can find it, but finding it on one layer is difficult, and the copy of the symbol doesn't have any information for reference.
Please help, thank you all
