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In order to overwrite data, you can use the Understanding the Product Catalogue screen, which deletes and recreates data.
Alternatively, delete the data on the destination store and retry the migration again from source to destination.
When performing partial migrations, it is important to know that some data depend on others. For example, while it is possible to migrate a Product, this data will not be complete unless the brands, categories, variations, etc have been migrated. Therefore, StagingPro migrates associated with other data elements EVEN IF THEY ARE NOT SELECTED INDIVIDUALLY by you. Below is a list of data fields that get migrated automatically.
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