Click the Cards button from the Rho Toolbar, and from the My Cards or Team Cards tab, select the card you want to restrict spending.
Click the Actions button in the upper right corner of the screen and select Card Settings from the drop-down list. From the Card Settings window change the Card Limit to the desired value.

How to create a new Rho Card with restrictions
Click the Cards button from the Rho Toolbar, and from the My Cards or Team Cards tab, click Create Card + in the upper right corner of the screen.
From the Setup your Rho Card page you will enter your name, email address, spending limit, and card type, either physical or virtual. You’ll also be able to set a list of restrictions, controls, and department budgets.
For more information about creating a Rho Card, see Create a new Rho Card.