Multi-body part design is a special tool inside Solidworks that allows for modelling a component by breaking it into a multiple number of similar parts hence the name Multiple-body part design.
With this, modification done on a part of the component in turn affects the whole model. This feature applies to bodies that can be modelled using linear or circular patterns and hence once the original body has been modified then all the other bodies follow suit
Below is a demonstration of this feature in solidworks.
We first create a sketch on any plane of your choosing.