Creating a unit (SysML)
You can create a Unit and then specify the Quantity Kind that it uses.
Note that the SysML profile includes standard SI Definition Units that you can use, such as Hertz, Newton and Watt - the SI Definition Units are provided in sub-Packages of the 
SI Definitions package.
SI Definitions package.To create a unit:
1. Right-click the Model or Package in which you want to create the unit, and select > > > .
2. Type the required name of the Unit, and then press the Enter key.
Alternatively, you can create a Unit on a Block Definition Diagram. How?
To specify a unit's quantity kind:
1. Right-click the Unit, and select > .
2. To use an existing Quantity Kind:
a. Select the Existing Item option.
b. Select the Quantity Kind that you want to use, and then click OK.
To create a new Quantity Kind to use:
a. Select the New Item option.
b. In the Name box type the name of the Quantity Kind that will be created, and then click OK.
To unset a unit's quantity kind:
1. Right-click the Unit, and select > .
2. Select the Untyped option, and then click OK.