In BRT you can go File-->Import--> Geometry. Select the From Graphics tab at the top, give it a name, description and style. Most likely prop_horiz_alignment, Define the curve definition, check the box "all selected elements added to a single alignment"
In the working space make sure all of your lines are highlighted for the alignment and then click apply.
It will bring in your linear, spiral, circular, spiral, linear elements as an alignment.