If your Schedule K-1 has amounts in both Box 1 and Box 2, you will need to add another K-1 to report Box 2 only.
Enter all the information from Part I and Part II of the K-1 on both copies. Include all information from Part III on the first copy - except for the amount in Box 2. The second copy should have only the amount in Box 2 from Part III.
If, however, you received additional information with Schedule K-1 that provides the breakdown of the amounts in the other boxes, use this info to split the other box amounts between the K-1s. Otherwise, follow the instructions above.