Is it possible to create extended runways in the FMC?Of so how?I have the manuals and all, but I am reading a completely different section, so it's faster to ask this in the forum!Thank you

do you want to make the runway length longer?

No it's an FMS feature if for instance ATC wants to vector you for a final which is further out than planned, stuff like this

You can create a FIX on the airport, airport's VOR or a point on the approach and specifythe runway direction and any length in miles you want. It'll show up in Green on your map.

On DEP/ARR page look for the runway name only. You can then create a RUNWAY EXTENSION by selecting it, the DME for the extension and the GPA you desire.