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This is a simple solution. All you need to do is declare a global variable (i.e. make it accessible everywhere in your sketch), and then add some additional code to "share" the servo between the different parts of the code.

Code you need:

Your library:

Servo servoname;
void foo() {
 //Some code here!
}
void bar() {
 //More code here!
}

The methods foo() and bar() are irreverent to the code, you just need to declare it.

Your library header file (name.h):

extern Servo servoname;

All you need to do then is import your new library and use servoname. You will have to still call servoname.attach([pin]); before you can use the servo, but then you just need to use the servo.

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