Simple:
1- Go to Helpers, and from the drop-down list choose Manipulators, then Choose Slider,
Click anywhere in the scene to place it.
2- If you want to prevent the user from selecting it by mouse, drag the Y Position slider all the way up
Until the Value is 1.0, and Check the Hide option. Now you shouldn't be able to see anything.
You can use the X Position value to control to horizontal placement of the slider
3- Now start typing in the Label area

Note: this tool is not made for this purpose. The Slider can be used to control other objects parameters
By using the Wire Parameters tool. A nice way to control many objects parameters just by a simple slider
On the Screen.
You can check YouTube for tutorials regarding the use of this feature in Max.
------------------------------------------------------
miledrizk@gmail.com
3DS Max 2025, V-Ray 7
3DS Max user since 2003 (3DS Max 7)
V-Ray user since 2008 (V-Ray 1.47)