Copy and paste

Hi, I'm very new to VBA and trying to create an invoice that will automatically copy and paste into the database when press a control button. The problem is I need to keep the previous data as well.

For example,
let say my 1st invoice is
a a1 a2
b b1 b2
c c1 c2
2nd invoice
d d1 d2
e e1 e2

I want it to appear in the database as
a a1 a2
b b1 b2
c c1 c2
d d1 d2
e e1 e2

Btw there are different number of items each time like 1st has3 items and2nd has 2 items