查看存储库维护.

一旦您拥有整个旧存储库的转储文件，就可以使用svndumpfilter提取所需的部分.

Once you have a dumpfile for the entire old repository, you can use svndumpfilter to extract just the portion that you want.

我不知道使用TortoiseSVN的方法.

I am not aware of a way to do this with TortoiseSVN.