Recalling Table Index

I am using a form (CIForm) to update a table T_CI which has three fields: ciIndex (the key) CItxt & Date.
On the CIform, there are two fields.
On successfully passing the information to the T_CI, the CIform goes to the next form-COGForm which updates another table T_COG.
T_COG has many fields all on the new COG form. But I need to pass to T_COG the value ciIndex. I don’t know what it is.
How do I do that?
The only workaround I see is to ‘trap’ CItxt as a cookie and pass that value to the COG form ( first altering the T_COG from ciIndex to CItxt) - which sweems very clunky
Thanks in advance