Copy and paste at a defined line (inputbox?)

Hello everybody. I am real beginner under VBA...
Here is my problem:

A B C D G H I
line Date Name Value
1 Paul Today Paul 20 000
2 1/07 10 000 Roddy 15 000
3 2/07 15 000
4 3/07 17 000
5 4/07
6 5/07
7 Roddy
8 1/07 8 000
9 2/07 10 000
10 3/07 13 000
11 4/07
12 5/07

Everydays, values in I are updated with a Vlookup, and I copy and pastevalue these figures in D column. If today we are the 4/07, so I would copy 20 000 in D5 and 15 000 in D11.
Problem is that I have actually more than 100 names...

I'm thinking of a solution that can automaticly copy the values in I in appropriate correct sheets with a VB code.

Note that there are always the same numbers on lines (6)between where I want to paste each figure (if I copy 20 000 in D5, then I would copy 15 000 in D5+6 = D11, then in D11+6=D17 etc
What I am thinking is a input box which would ask me: "which lines to you want to start pasting?"
If I say: line "5", then it copies I2 in D5, I3 in D5+6=D11 etc
Tomorow, with new values in I, I will say: start in line "6", then it will copy I2 in D6, I3 in D6+6=D12 etc...

I think an input box would be the best option, but I am not sure about that. Don't hesitate to ask me to clarify if need be.
Many thanks for your help :-)