ช่วยสอนฉันหน่อยเกียวกับเรื่องนี้ฉัน

Help teach me about this subject.I do not understand the procedure. If the same company but different addresses. And we unfortunately expired last updated we need references that are based on that, we use the command? But the same code?And this date must match exactly? Or that this must count backwards again 15 days?

Help me about it,
I do not understand the process
if the same company. But the difference between
us and unfortunately we have to refer to the expiration date at our command?
But the same code?
And exactly this. The date for the match?
Or that this must date back another 15 days?