I figured it out:
First you have to insert a row without a MV value
insert into TableA (name) values('aName');
then these statements will insert the multivalue values
INSERT INTO TableA (mymvfield.[Value]) values( 1) where id = 1;
INSERT INTO TableA (mymvfield.[Value]) values( 3) where id = 1;
There is probably a way to streamline that whole deal...but at least this is working now.