You can import data from multiple queries (and data sources) into a model, and each of these imports can be separately scheduled.
If you want to run multiple Import data jobs together, in a specified order, create a source grouping. A grouping can include jobs from public dimensions as well as the model. Running the grouping refreshes the public dimensions and model together.
Scheduled jobs can also be viewed, deleted, and refreshed via: Navigation Bar → Connections → Schedule Status.
If any rows in the dataset were rejected, you can select Download rejected rows to save the rejected rows as a .csv file. You can then examine this file to see which data was rejected. You could fix the data in the .csv file and then import the .csv file into the model using the Import Data workflow, or fix the data in the source system.