Increment() where is the help

Business Central/NAV Developers Forum
1

I have searched NAV 9 help but cannot find any reference to Increment.

Here is a code snippet in CU80

IncrAmount(VAR TotalSalesLine : Record “Sales Line”)
WITH SalesLine DO BEGIN
IF SalesHeader.“Prices Including VAT” OR
(“VAT Calculation Type” <> “VAT Calculation Type”::“Full VAT”)
THEN
Increment(TotalSalesLine.“Line Amount”,“Line Amount”);

Where can you find this and similar mathmatical functions?