Converting columns into rows with different values

Question

I have a CSV file with 16 columns.

The first 10 (A-J) are contact information, the last 6 are different phone numbers, sometimes for the same contact.

My objective is to create duplicates of the first 10 columns with the new 11th column (K labeled PHONE) representing one phone number from the last 6 columns.

I am looking to keep all values from A to J as is in their own columns (no merging) Value in column K should have only one phone number.

Here is a link to a sample of data with “before”: what the original sheet was and “after” an example of what the result should look like.

Answer 1

A result similar to the expected can be obtained using the following formula:

={{"First Name","Last Name","Street Address","City","State","Zip",
    "Mail Street Address","Mail City","Mail State","Mail Zip","PHONE"};
  SORT(FILTER({
   {A3:J,K3:K};
   {A3:J,L3:L};
   {A3:J,M3:M};
   {A3:J,N3:N};
   {A3:J,O3:O};
   {A3:J,P3:P}},
 {K3:K;L3:L;M3:M;N3:N;O3:O;P3:P}<>""),1,FALSE)}

Work example here

Answer 2

This solution is not limited to just 8 lines. The formula is very complex and I would not be able to explain it to you. Try the test file