OK, if the Points on the Spline were created using a 'Point Set' with the 'Associative' option was toggled ON, there are a couple of things that you can do. You could go to...
Edit -> Transform...
...select the Spline, hit OK, select 'Scale', pick or enter some reference point for the Scale to be applied relative to, enter the scale value (if it's a uniform scale; select the 'Non-uniform Scale' option if it's not), hit OK, select 'Move' and when the one screen message comes up select 'Transform Parent'. The Spline will sacle and the Points will go along for the ride adjusting accordingly.
Alternatively, particularly if you would like to perhaps have more control over how you're applying the scale or perhaps would like to dynamically do so, go to...
Edit -> Surface -> X-Form...
...set the Type to 'Scale', select the Spline, area select all of the poles displayed, in the 'Scale Direction' section of the dialog se it to 'Scale Uniform' (unless of course you would like to use one of the several other scaling methods available), select the appropriate scheme to define the Scale Center, and after all the options are set just grab any of the select poles and drag it and the Spline will change in size. Once you get your desired result, just hit OK and the Points will snap into place on the now resized Spline.
If you wish to not change the size of the original Spline, then create a non-associative copy first, making sure that the copy you then manipulate is the parent to the Point Set.
John R. Baker, P.E.
Product 'Evangelist'
Product Design Solutions
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
To an Engineer, the glass is twice as big as it needs to be.