[sanjeevlj]

I have a mc9 file, and the tools are set for machining as such
dia5 at no.5
dia10 at no.6

Now i have another library
where dia5 is at 6 and
dia 10 is at no.5

Exchanged...

So how automatically i can set this new library to work with old file.

[psychomill]

Are you asking about tool numbers got changed? Or Toolpath operation number got changed?

I think you're asking about toolpath number (order of operations). Just simply select the toolpath operation with a left mouse click and move it down one toolpath (while holding the mouse button) just like you would any windows file.... (or up depending on which operation you select to move)