Does anyone know where I can get the torso of my Motorcycle Jacket taken in by someone...
This is not easy. Motorcycle jackets are complex, with vents, special pockets, back protection, belts/velcro at the waist, inner pockets, inner liner. If you simply take in the torso on the outer leather layer you'll then misalign many features, such as pockets.
Say a pocket is positioned so your hand slips in naturally, from your center line, say 75 degrees to the outside. If you take in the torso from the side, the easiest way, your pocket will me more like 90 degrees from the center line, making it awkward to insert your hand. This is only a simple example.
Say you want to reduce the shoulders on a jacket. You remove the sleeve and cut the opening closer to the neck. Now the sleeve hole is larger than the original sleeve hole, so you'll need to patch the arm pit to make up for the size difference. These alterations can compromise the structural integrity of the jacket.
Summary: If you have issues with torso or shoulder, it is cheaper and better to sell the jacket and buy one that fits. Not everything can be butchered and put back together.
That being said, if you have a fashion leather jacket with many less features, or an old school riding jacket with no armour, then it might be possible, but still expensive, and could compromise the structure of the jacket.
