Adding new input fields in CRM

Hello All,

I have the below requirement.

I have to introduce new input fields in CRM for sales order creatio. These fields are to capture customer PO line item number and customer material number.

Is there any standard field already available where we can capture this and replicate to ECC?.

If not please help me on the below things.

How can i introduce new fields in CRMD_ORDER and map these fields to ECC fields.

Please help me.

Regards,

Shanto Aloor