[]
Gets or sets the location within the document associated with the hyperlink.
This value identifies the document-internal target of the hyperlink, such as a worksheet range reference.
string SubAddress { get; set; }
Property SubAddress As String
IRange cell = worksheet.Range["A1"];
IHyperlink hyperlink = cell.Hyperlinks.Add(cell, null, "Sheet1!$C$3:$E$4", "Go to details", "Details");
hyperlink.SubAddress = "Sheet1!$A$1";
string subAddress = hyperlink.SubAddress;