I managed to Change this Query so as if True The Owner/HorseID wont show:

SELECT Format(tblHorseDetails.OwnerPercent,"0.0%") AS Expr1,
IIf(IsNull(tblOwnerInfo.OwnerLastName),'',tblOwnerInfo.OwnerLastName & ' ')
& IIf(IsNull(tblOwnerInfo.OwnerFirstName),'',tblOwnerInfo.OwnerFirstName & '
') AS OwnerName, tblOwnerInfo.OwnerID, tblHorseDetails.Invoicing
FROM tblOwnerInfo, tblHorseDetails
WHERE (((tblOwnerInfo.OwnerID)=[tblHorseDetails].[OwnerID]) AND
((tblHorseDetails.Invoicing)=No) AND
((tblHorseDetails.HorseID)=[Forms]![frmInvoice]![cbHorseName].[value]));

BUT how would I change this Row souce to achieve the same result??

SELECT IIf(isnull(tblOwnerInfo.OwnerLastName),'',tblOwnerInfo.OwnerLastName
& ' ') &
IIf(isnull(tblOwnerInfo.OwnerFirstName),'',tblOwnerInfo.OwnerFirstName & '
') & IIf(isnull(tblOwnerInfo.OwnerTitle),'',tblOwnerInfo.OwnerTitle) AS
Name, Format(OwnerPercent,'0.0%') FROM tblOwnerInfo, tblHorseDetails WHERE
tblOwnerInfo.OwnerID=tblHorseDetails.OwnerID And tblHorseDetails.HorseID=38;

Thanks for anyone that can help me.................Bob