Hi Dan
This part of the expression
t = L.marker.key(“start”).time – C.layer(thisComp.name).startTime;
is referring one named mark in a layer of an external composition.

What I need is the expression works without using a “name” of the mark, just the mark. So that way I can use several text layers with the expression and they will be activated when I add more marks to the layer.
Thank you again