Walking line - multiple projects

We have lines where multiple projects overlap. Our trappers would like to use the walking line feature and service both projects at the same time. The trappers are members of both projects. One possible way to implement this, is to allow selection of more than one project in the app, and then show all the lines of the selected projects, and allow selection of more than one line for walking the line.

I’d also like the ability to select multiple lines for Walk the Line and Manual Complete (and for Add Catches/records on the website), although in my case the lines are within the same project. Many of our lines are based around existing walking track networks on a property, and therefore aren’t very linear, with side branches, loops, overlaps with other lines along the property boundary, etc. It would be nice to be able to subdivide these enormous whole-property “lines” into smaller single-track sections without losing the ability for a trapper to quickly autofill defaults for their whole day’s work.