要将另一个文档的内容复制到当前文档

Hello @nichaoshou

if there are other ways to copy data from other documents into the current document

Do you mean via DocBuilder methods? Recently we discussed similar question in other thread, please check it out: Insert data of Excel into Document or PowerPoint at particular Page or Slide - #2 by Alexandre
If I misunderstood your request, please clarify it.