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It sounds like you need a string field to record the name of whatever product they are most recently interested in, as opposed to a boolean field?
As per Sydney's suggestion, you might want to set up an appending string field, so it adds the new value to the end rather than overwriting it. You could use a method similar to that outlined here:
https://community.marketo.com/MarketoArticle?id=kA050000000KzejCAC
where you set the value of their Product Interest to {{lead.Product Interest}}; {{lead.Product Interest Temp}}
where Product Interest Temp is another custom field meant to temporarily store the additional value.
That way if someone's Product Interest was "Marketo" and then later on they filled out a form and chose "RTP", the data value saved in Marketo would read "Marketo; RTP"
It sounds like you need a string field to record the name of whatever product they are most recently interested in, as opposed to a boolean field?
As per Sydney's suggestion, you might want to set up an appending string field, so it adds the new value to the end rather than overwriting it. You could use a method similar to that outlined here:
https://community.marketo.com/MarketoArticle?id=kA050000000KzejCAC
where you set the value of their Product Interest to {{lead.Product Interest}}; {{lead.Product Interest Temp}}
where Product Interest Temp is another custom field meant to temporarily store the additional value.
That way if someone's Product Interest was "Marketo" and then later on they filled out a form and chose "RTP", the data value saved in Marketo would read "Marketo; RTP"