Are you referring to the new Start Menu in Windows 10 (PC)?
If yes, you should find a small piece of text or label above certain groups of tiles, e.g. one of the default labels is "Life at a glance". Click and drag (or tap and drag) that label to move all the apps that have been placed under that label.
Hence, it would be advisable to group the apps you want to Pin under one label, e.g. all weather apps under "Weather" and all Office apps under "Office" (you can choose whatever label name you want) so that dragging them as a whole group of tiles will be easier.