Placing payments (lookup question)

Question

Hello. First of all, thanks to anybody who reads this and replies to it.
I’m getting really frustrated with myself because I’m a bit dyslexic (seriously) and I’m having some difficulty with HLOOKUP, VLOOKUP and LOOKUP.
Basically, I have a table with rows of clients, like so
Client
Invoice value
Payment days
A
$100
15
B
$30
8
C
$500
60
…and I have a vast (120+ column) time/client matrix, of which I’ll display just a few coulmns, on the understanding that it extends both left and right.
Client
6
7
8
Client A
Client B
Client C
Now, what I am trying to do, fairly trivially, is create a formula to insert in each cell of the client matrix a paymet if and only if it is due from that client on that day, so essentially, I’m looking for this output (given the client list illustrated above - client B is expected to pay $30 on day 8). For the sake of the exercise, the list of clients can be considered fixed, so I’m only looking for a unidimensional lookup here.
Client
6
7
8
Client A
$0
$0
$30
Client B
$0
$0
$0
Client C
$0
$0
$0
It’s fairly clear to me that I must create a formula that in client row of the time/client matrix looks at the header (the day), and then if and only if the corresponding payment day is equal to that value returns the invoice value, but exactly how I might go about expressing it to a machine in such terms mystifies me.
Please help.

Answer 1

Hi qubex,
Here is a solution in one table. You can drag the right hand columns off this table and drop them onto the canvas to create a new table. The Formulas will automatically adjust.
Client
Invoice Value
Invoice Date
Payment Days
Due Date
Overdue days
Overdue?
A
$100.00
1 Oct 2014
15
16 Oct 2014
24
Overdue $100.00
B
$30.00
22 Oct 2014
8
30 Oct 2014
10
Overdue $30.00
C
$500.00
23 Oct 2014
60
22 Dec 2014
-43
Formula in E2 (and Fill Down)
=C2+D2
Formula in F2 (and Fill Down)
=ROUND(DUR2DAYS(NOW()−E2),0)
Formula in G2 (and Fill Down)
=IF(F2>0,"Overdue "&B2,"")
IF F2 is greater than zero, then insert "Overdue" and the invoice value. Else insert "" (NULL).
Select Columns E to G then "hard click" (bottom left of the trackpad) until they "lift" off the page. Drag them to a blank part of the canvas to create a new table.
Table 1 now looks like this
Client
Invoice Value
Invoice Date
Payment Days
A
$100.00
1 Oct 2014
15
B
$30.00
22 Oct 2014
8
C
$500.00
23 Oct 2014
60
The new table (Table 2) now looks like this
Due Date
Overdue days
Overdue?
16 Oct 2014
24
Overdue $100.00
30 Oct 2014
10
Overdue $30.00
22 Dec 2014
-43
Formulas have adjusted to refer to Table 1. You can move (Cut and Paste) Table 2 to another Sheet if you wish. Formulas will adjust once again.
Regards,
Ian.
Edit: Oops, dragging columns E to G to create Table 2 has lost Client names. Sorry. Ian.