Controls creation/deletion of entries in this table according to the
RowStatus textual convention, constrained to support the following
values only:
createAndGo
destroy
To create an entry in this table, the following entry objects MUST be
explicitly configured:
usdAtmSubIfRowStatus
usdAtmSubIfLowerIndex
In addition, when creating an entry the following condition must hold:
A value for usdAtmSubIfIndex must have been determined previously,
by reading usdAtmSubIfNextIfIndex.
A corresponding entry in ifTable/ifXTable/usdIfTable is created or
destroyed as a result of creating/destroying an entry in this table.