Merge Multipart Feature Line

Hello,
I'd try to merge multipart feature line on my pipeline data, but it can't.
I know multipart can't be merge, but anyone know how to do this?

I need your advises.

For your information, i work in version environment.

Please let me know if my information didn't help you.

Sorry for my bad english.

Regards,

Anugrah Adityayuda
IT Staff