Process concatenate

Hello,

I have a process that concatenates documents which are generated. For the simplicity i don't mention the wait steps below.

Step 1: Generate document X

Step 2: If field "ABC" = "A" then generate document Y

Step 3: Concatenate document X and Y

Now, when Field "ABC" has indeed the value "A" it won't concatenate document X and Y in step 3.

Because if have more than 1 check (also more step 2) my script is getting difficult if i have to test in step 3 if step 2 has succeeded.

Perhaps anyone knows a good solution?

Thx!