Editing one equation in a model

[kszynkar]

Is there a way of editing one line of a model? I would like to read one line into a string, edit it, then edit that one line of the model inside a for-next loop.

[kszynkar]

sorry, please ignore. I think I found a work around

[kszynkar]

I used a string to put the equation together in a loop, then used the resulting string in "{}" brackets to add it to the model