This TDL program adds a field (named MyField) in the Ledger Master. This new field appears in the section "Mailing and Related details" when you create Ledger under "Sundry Debtors" or "Sundry Creditors" group.
In case, if you require any other field in Ledger Master, you can send in you Queries to tdlplayground@rtslink.com.
Click here to download the Example 19 compiled file and the source-code.