Q.Little Leave Linden Transplanted But Upper Part Died. Growth Is Coming From The Lower Trunk Moving Upwards. Will Thsi Be A New Tr
ee? Whole tree remains, about 8\’ft tall. Growth is coming from lower trunk, not a stump

Certified GKH Gardening Expert
It sounds like the upper graft portion, which is usually a different Linden species, has died. It sounds like the bottom portion, or the rootstock, is still alive. This WILL be a new tree or trees, but it may not be the tree that you purchased.
In the future, these trees will prefer a Spring or Fall planting. The heat of Summer will almost always cause the transplant to fail.
Here are some articles to help:
https://www.gardeningknowhow.com/ornamental/trees/linden
https://www.gardeningknowhow.com/ornamental/trees/tgen/what-is-a-graft-collar.htm