Create transform map: A transform map is a set of field mappings that determine how the source data in the import set table is transformed into the target data in the hardware asset table. You can create a transform map by using the Load Data UI page, or by navigating to System Import Sets > Create Transform Map. You need to specify the source table, the target table, and the field mappings between them. You can also define coalesce fields, which are used to prevent duplicate records from being created or updated. For example, you can use the asset tag or the serial number as a coalesce field.
Load data: To load data into the import set table, you need to select a data source, such as a file, a JDBC data source, or a web service. You can use the Load Data UI page, or navigate to System Import Sets > Load Data. You need to specify the source type, the file name or the connection URL, the sheet number and the header row (if using a file), and the import set table name. You can also preview the data before loading it into the table.
Run transform map: To run the transform map, you need to navigate to System Import Sets > Transform Maps, and select the transform map that you created. You can then click on the Run Transform button, which will execute the field mappings and transform the data from the import set table to the hardware asset table. You can also view the transformation history, the transformation statistics, and the transformation log to monitor the progress and the results of the transformation.
Reference:
Importing Hardware Assets into ServiceNow, which provides a step-by-step guide on how to import hardware assets into ServiceNow using an excel spreadsheet, an import set table, and a transform map.
Hardware Asset Inventory Management, which explains how to streamline inventory stock orders, empower employees with a robust asset catalog, monitor stock depletions, track shipments, scan assets with a mobile device, and plan asset refresh cycles.
Getting Started with ServiceNow Hardware Asset Management, which provides general procedures and forms for performing asset lifecycle management activities in ServiceNow.

Explanation
Original costs are the costs that are incurred when acquiring a hardware asset, such as purchase price or lease cost, delivery costs, and replacement parts1 Operational expenses are the costs that are incurred when maintaining and using a hardware asset, such as resource costs for support, warranty costs, and maintenance agreements1 Original costs and operational expenses are used to calculate the total cost of ownership (TCO) of a hardware asset, which is the sum of all costs associated with an asset throughout its lifecycle1 TCO helps to measure the value and performance of a hardware asset and optimize the asset management strategy1 References: 1: Total cost of ownership - ServiceNow

According to the ServiceNow Hardware Asset Management documentation, a stockroom is a location where assets are stored and managed. A stockroom must have an assigned manager who is responsible for overseeing the stockroom operations and inventory. The stockroom manager must have a valid email address to receive notifications and alerts related to the stockroom, such as low stock levels, stock transfers, and stock orders.
The other options are not primary requirements for the warehouse stockroom. The stockroom does not need to have an assignment group, a valid time zone, or a valid mobile phone.