You don’t have to this as a separate Journal, you could simply add an extra two lines within either b) or c) to represent that journal entry.
Whilst I understand that it personal accounting, but it appears that you are just having a money merry-go-round as nothing is actually being bought. Let me explain it this way:
You take 2,500 from the bank via Dr Card and combine this with 3,500 taken from your front left pocket (called Cash) and combined them together to be 6,000 and have put all that in your right front pocket (called XYZ Subs). In the final transaction you are taking another 3,000 from the bank via Dr Card, plus 650 from the front left pocket (Cash) and combining that with the 6,000 in the right front pocket (XYZ Sub) and have transferred all this, 9,650 to your rear hip pocket (called Prod 1). This 9,650 is being added to the existing 10,000 so the rear hip pocket (Prod 1) now contains 19,650. By having (b/f) in the description informs me that nothing is being actually purchased but something is being actually accumulated, the ever increasing fat wallet in the rear hip pocket.