Let me see if I understand you correctly...
What you have is something like:
Game Setup Stuff
.
.
.
Do
do stuff
.
.
do different stuff
.
.
.
Really fancy stuff here
.
.
.
Loop
And, you are looking for a way to do something like:
Game Setup Stuff
.
.
.
Do
do stuff
.
.
do different stuff
.
.
.
goto do stuff
Really fancy stuff here
.
.
.
Loop
Where the goto do stuff line will send the program back to the 'do stuff' line of code?
There are a number of ways to deal with that, but they all depend upon specific needs.
If it will keep cycling, a simple Do Loop will work.
If you have a specific block of code that you need to repeat in specific circumstances, you should create a function that you can call every time you need that code to run.
You can also use For and While loops to repeat specific blocks of code a certain number of times.
You can also use goto to execute a specific block of code, although a lot of pro coders frown upon goto because they tend to create spaghetti code.
I'm unaware of any command that would allow you to 'Go To Line 4' and continue from there.
If you can give more detail and perhaps a code snippet that would demonstrate your specific needs a bit better, we could probably give you more specific help. I don't think that the answer is going to be quite the way that you had envisioned, however.