Setting the multiplicity of a flow property (SysML)
By default, a new Flow Property has a multiplicity of 1.
To determine the multiplicity of a flow property:
1. Open the Flow Property's Property Pages.
2. Click the Options tab.
3. The multiplicity is shown in the Multiplicity list.
To set the multiplicity of a flow property:
1. Right-click the Flow Property, point to Set, and then click Multiplicity.
2. In the dialog, from the Multiplicity list select the required multiplicity.
If you select Use Defined, specify the required multiplicity in the text box. For example, for a multiplicity of 2 to 4, type 2..4.
3. Click OK.
If the Flow Property is a real redefinition, the Multiplicity is set for the Flow Property in context, without changing the Multiplicity of the Flow Property that is redefined by the redefinition. For more information about redefinitions, click here 
.
.