We made some verifications in Online and Desktop version, and you only have the option to include one T1198. Why do you need more than one? 

Unless you have received 2 lump-sum payments from 2 different sources, you can't add more than one T1198 in your return, but, again, this is a specific situation and we suggest you contact CRA to see if it is possible and how to proceed.

Here is the link to contact CRA.

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