Converting an Arduino code to be compatible for VScode

Hi i have written a code in online Arduino IDE. It has around 55 .ino files with a lot of global variables. The code has become too big for me to handle on the online Arduino IDE since there is no intellisense. I am trying to compile it with VS code arduino, but i am facing multiple issues. I want someone to make the changes which can make it compatible to be compiled in VS Code.