This post is related to tablespaces with regard to partitioned indexes, but can be used with other storage attributes.
When creating local indexes make sure that an index tablespace is specified before you start specifying the individual partitions. For Example:
create index ... on ... tablespace ...
partition ... local ...
To change the default tablespace for an index partition then use the following.
alter index ... default attributes tablespace ...
note: When a local index is created as part of a new partition, then the tablespaces specified above will also be created.