Hi bjjeong
You can search for Unit of Measure, position yourself on PCS unit of measure, and click Coupling-> Set Up Coupling to synch unit of measure to CRM.

To transfer products from CRM, you can go to Connection Setup, open Integration Table Mappings, position yourself on ITEM-PRODUCT Integration table mapping, verify that directions of synchronization is Bidirectional, and remove the flag in Sync only Coupled records.

After that click on Run Full Synchronization and items that don't exist in Financials will be copied from CRM, and records that don't exist in CRM will be copied from Financials.
After full synchronization completes, make sure to set Sync only Coupled records (if you wish) to lower the synch load.