First post, not sure it is the right place, hi there!
For 2015 I would like to keep a shadow bookkeeping in Calc in order to check our bookkeeping program for a while.
Input: In order to keep things simple: three columns with Description, Amount and a LedgerCode.
Output: Sums per LedgerCode
Several solutions are thinkable of, such as conditional testing and lookups. However, if the list grows and contains thousands of lines it will influence performance.
The question: What is the most efficient approach in order to keep the sheet alive after adding record 2384?
Example:
LedgerCode: 1, 2, 3