I’m not sure what the part is, but I did to a search on “LFE3” and the first hit is the following part (at DigiKey): Lattice Semiconductor Corporation LFE3-70EA-7FN672I. This is a 672 pin BGA. My guess is the schematic that you are copying isn’t from KiCad, and each of the U1-# symbols are different parts (or gates) of the same chip. In KiCad they would be numbered U1A, U1B, etc.
There is a thread here that I saw linked recently about drawing multiple different shaped gates for a component, but I didn’t just now see it in the FAQ area. Hopefully someone else has that link on their fingertips that can post it here to give you a guide on drawing all the different gates for that huge pinout chip. (If that really is the part in question.)
I found the link to the thread. Here you go: IC footprint VCC+GND. (This tutorial isn’t for your exact use-case, but should be close enough to understand the steps required.)