This function enables the creation of fillet surfaces between 2 sets of smoothly connected faces (each set consisting of one or more faces) while defining varying minimum radius values on a picked point.
Required Step 1 
Enter the Max. Gap value, pick the first set of faces and exit: (In this example, all the vertical faces have been picked).
Note: If the gaps between the neighboring faces are smaller than the Max Gap value, fillets are created and healed to each other. If they are larger, the fillets are not created and a warning is displayed.
Required Step 2 
Pick the faces of the second set and exit.
Required Step 3 
Pick any point that on the 1st or 2nd set of picked faces or on their edges. An editable Minimum Radius is attached to each picked point marked with a small arc. You can remove individual variable values or click Remove all figures to clear them all.
Flip the arrow directions (if necessary). Toggle Linear Transition to Spline Transition if required.
If required, toggle Don't Trim to Trim to create a number of fillet faces.
When working with non-periodic groups, (when the Guide Curve is not closed), the toggle option Extend/Don't Extend defines whether or not the ends of the fillet face (or group of fillet faces) will be extended to meet the boundaries of the input faces.
In case of closed Guide Curve – this SPT will not affect the result.
The preview button displays the result with open gaps and not trimmed:
If this is the final result, press OK
or Apply 
in the Feature
Guide to complete the function. A fillet is created between the face
sets.
When completed, the Filleted face will appear in the Feature Tree as follows:
