How to extend innodb files?

[Vokern]

Hello,

Currently I have the setting:

innodb_data_file_path=ibdata1:10G;ibdata2:10G;ibdata3:10G;ibdata4:10G:autoextend

Because the last file of ibdata4 is very large (more than 50G), if I
want extend the data to more files, for example, ibdata5, ibdata6...
how  to do it?

Thanks!