As others have mentioned the functionality you're asking for can be found by making an iPart, and then creating a custom column or custom cell input as shown in the illustration below. Once a column or cell has been designated as a custom parameter, you can specify a range or increment (if needed). When placed in an assembly you are prompted to enter a size of your choosing at that time.
How to create a custom iPart (taken from the help files):
A custom column or cell is indicated by a blue background.
For more reading on custom iParts see the How do standard and custom iParts differ? topic at this link:
Other options would be to use iLogic to set the part up, or publish the iPart to Content Center and use it as a content center component.
I hope this helps.
Best of luck to you in all of your Inventor pursuits,
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