Hallo! I am using Allplan 2021 for my thesis and I have several questions.

1. After exporting attribute excel file containing specifically walls's data, I change data under material column from "Linoleum" to "concrete". I import the updated excel to Allplan directly but in the wall attribute nothing has been changed. (attached pictures can be referred)

2. How could the area of building envelop be measured? Is there possibility to create surface for whole building?

3. Is there any base map concept in Allplan? I have searched for long time on importing a map (such as a satellite image or digital terrain model) as the site/ surrounding. Is Landxml file the only option or there are other possible file formats? Moreover, could the coordinate reference system be set in Allplan?

Thanks a lot!!