How to add a Business Partner:

// Create an instance of the BP object
SAPbobsCOM.BusinessPartners sboBP = (SAPbobsCOM.BusinessPartners)_sboCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oBusinessPartners);
 
// Set the basic properties
sboBP.CardCode = "S00001";
sboBP.CardName = "New Supplier 1";
sboBP.CardType = SAPbobsCOM.BoCardTypes.cSupplier;
// Set optional properties
sboBP.CreditLimit = 100000;
sboBP.Currency = "USD";
 
// Add the BP
int iRetVal = sboBP.Add();
if(iRetVal != 0)
{
    // Add failed so report error to user
    _sboApp.SetStatusBarMessage("Error creating BP: " + _sboCompany.GetLastErrorDescription(), SAPbouiCOM.BoMessageTime.bmt_Medium, true); 
}

How to add an address to an existing BP:

// Create an instance of the BP object
SAPbobsCOM.BusinessPartners sboBP = (SAPbobsCOM.BusinessPartners)_sboCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oBusinessPartners);
 
// Use the GetByKey method to retrieve the existing BP
if (sboBP.GetByKey("S00001"))
{
    SAPbobsCOM.BPAddresses sboAddresses = (SAPbobsCOM.BPAddresses)sboBP.Addresses;
    // Check to see if addresses already exist
    if (sboAddresses.Count > 1)
    {
        sboAddresses.Add();
    }
    else
    {
        // First address always exists, but may be blank
        sboAddresses.SetCurrentLine(0); 
        if (sboAddresses.AddressName != "") sboAddresses.Add();
    }
    sboAddresses.SetCurrentLine(sboAddresses.Count - 1);
    // Set the properties for the new address
    sboAddresses.AddressName = "Billing2";
    sboAddresses.AddressType = SAPbobsCOM.BoAddressType.bo_BillTo;
    sboAddresses.Street = "789 Virtual Street";
    sboAddresses.ZipCode = "1234";
 
    // Update the BP
    int iRetVal = sboBP.Update();
    if (iRetVal != 0)
    {
        // Update failed so report error to user
        _sboApp.SetStatusBarMessage("Error updating BP: " + _sboCompany.GetLastErrorDescription(), SAPbouiCOM.BoMessageTime.bmt_Medium, true);
    }
}
else
{
    // BP wasn't found so report error
    _sboApp.SetStatusBarMessage("Unable to find S00001 in the database", SAPbouiCOM.BoMessageTime.bmt_Medium, true);
}

How to update an existing address on a BP:

// Create an instance of the BP object
SAPbobsCOM.BusinessPartners sboBP = (SAPbobsCOM.BusinessPartners)_sboCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oBusinessPartners);
 
// Use the GetByKey method to retrieve the existing BP
if (sboBP.GetByKey("S00001"))
{
    SAPbobsCOM.BPAddresses sboAddresses = (SAPbobsCOM.BPAddresses)sboBP.Addresses;
    // Loop through the addresses to get to the correct address
    for (int i = 0; i <= sboAddresses.Count - 1; i++)
    {
        sboAddresses.SetCurrentLine(i);
        if (sboAddresses.AddressName == "Billing" && sboAddresses.AddressType == SAPbobsCOM.BoAddressType.bo_BillTo)
        {
            // This is the address I want to update so change the properties
            sboAddresses.Street = "765 Virtual Road";
            break;
        }
    }
    // Update the BP
    int iRetVal = sboBP.Update();
    if (iRetVal != 0)
    {
        // Update failed so report error to user
        _sboApp.SetStatusBarMessage("Error updating BP: " + _sboCompany.GetLastErrorDescription(), SAPbouiCOM.BoMessageTime.bmt_Medium, true);
    }
}
else
{
    // BP wasn't found so report error
    _sboApp.SetStatusBarMessage("Unable to find S00001 in the database", SAPbouiCOM.BoMessageTime.bmt_Medium, true);
}