From SCI Wiki
This can be accomplished with inline assembly code. Verbatim from the 'Inline Assembly' page in the SCI Studio Help File:
// the inline assembly is quite versatile. Here's a crafty example: (if(something) (asm jmp _a_goto_label) ) (asm _a_goto_label: )
Note that the inline assembly code functionality is implemented in SCI Studio, but not in SCI Companion.