Increasing the "range" of a potentiometer?
As I suspected, your question is a XY problem.
You don't need 100 k potmeter because there are other ways to get the same result using a 10 k potmeter.
You think that you need a 100 k potmeter for a 555 timer circuit. The timing of a 555 circuit is determined by a resistor (100k ohm) and a capacitor (of for example 100 nF).
That 100 kohm + 100 nF will give almost the same result if you use a 10 kohm resistor and a 1000 nF = 1 uF capacitor!
So just increase the value of the capacitor by a factor of 10. Also decrease all the resistors that are part of the 555's timing circuit by a factor of 10 (so a 100 kohm potmeter becomes a 10 kohm potmeter) and you're done.
Now I hope that you see, as I commented, that you have to explain what you're going to do with that potmeter. In case of a 555 timer circuit, the solution is simple and easy. Ideally you would include the schematic of what you're working on. When we would see that 555 timer, almost everyone here will know you only have to make the capacitor larger and then you can just use your 10 kohm potmeter.