Can we split the partition into multiple sub partition

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SQL

According to our classes, we have learned that after partitioning the table into multiple partitions examples P1, P2, P3, and P4 etc. Later if we want to is it possible to split P2 into multiple partitions rather than just two partitions. If yes, then could anyone explain with an example. Thank you.

What I have tried:

We tried

ALTER TABLE SPLIT PARTITION p0 INTO 
  (PARTITION p01 VALUES LESS THAN (25),
   PARTITION p02 VALUES LESS THAN (50), 
   PARTITION p03 VALUES LESS THAN (75),
   PARTITION p04);
ALTER TABLE SPLIT PARTITION p0 INTO 
  (PARTITION p01 VALUES LESS THAN (25),
   PARTITION p02);

****BUT GETTING ERROR MESSAGE****