Hi Booleano, your question was:

> but when using the "sBridge" function, I can't get these two "red lines" to join together, forming the
> object's handle. What would be the correct process to achieve this?

With your object like this:



If you want to make a result like this as you already have in the posted file:



You could get that by drawing in 2 lines in the side view like this:



Then select the object and run Boolean difference, using the lines as the cutting objects.

Delete these pieces:



Then select these for _sBridge:




Another way is you can select this face:



Run Transform > Rotate > Rotate Axis, click 2 points across the middle of the face for the rotation axis:



After you have placed the axis, type 45 and push Enter to rotate it by 45 degrees:



Repeat on the lower one but with negative 45 (-45) degrees.

- Michael