Organization Model download from R/3 to CRM

Hi Guys

We are maintaining the complex Organization model in R/3 system and we need to Download the complete organization Model from R/3 to CRM and its relevant Organization structures too. I could not found a way what is the download object to be used to download the Organization model from R/3 to CRM .

will the Transaction CRMC_R3_ORG_STRUCTURE download the Organization model also , and what is the prerequisites for this organization model download

Thanks in advance

Warm regards

Rajasekhar