To create a new quote estimation process that involves multiple steps and a variable number of rows of data, the consultant should recommend the following OmniScript elements:

Edit Block: This is an element that allows the user to add, edit, or delete multiple rows of data in a table-like format. It can be used to capture the service category, number of hours, and hourly rate for each row.

Formula: This is an element that allows the user to perform calculations on data using mathematical expressions. It can be used to calculate the total for each row by multiplying the number of hours with the hourly rate.

Input Block: This is an element that allows the user to enter data using various input types, such as text, number, date, picklist, etc. It can be used to display the formula result for each row and the final price for the quote.

The elements that are not suitable for this scenario are:

Multi-select: This is an element that allows the user to select multiple options from a list. It is not relevant for this scenario, as the user needs to enter data in each row, not select from predefined options.

Step: This is an element that organizes the OmniScript into one or more pages. It is not relevant for this scenario, as it does not capture or display any data.