How to copy issues from one project to another

There are a couple ways of creating common issues in multiple projects. One way is to use the templating feature of the "Create" tab.

To create a template, fill out the issue title and some of the details and click on the "Template" button. This creates a reusable issue template that can be selected and modified before creating an issue.

The other way is to right-click on an issue in a list and select "Duplicate". Doing so will prepare the "Create" tab with the information from the issue. Then you can change the project and click on "Create Issue" to finishing duplicating it.

The duplicate works, but only one item at a time. I need to copy about 70 for each project.

There is no good way to bulk copy issues available right now. I think a new feature could be added pretty rapidly to accommodate this use case. I'll look into providing a context menu option to duplicate issues into another project. Then you would just need to select a group of issues, right-click and select a duplicate options, followed by a popup asking which project to copy the issues into.