Source: https://forum.macrium.com/21582/Cloning-to-a-smaller-SSD
In [Macrium] Reflect, select your source disk and click "Clone this disk". In the first step of the wizard where you specify the source and destination, select your smaller SSD as the destination. Then start dragging your partitions down from the source to destination one at a time, working left to right, but when you get to a partition you want to shrink, drag it down to the destination, click it down there, and select "Cloned partition properties". Change its size on the destination as desired, then proceed with any remaining partitions.
