Yes, multiple members can be created under one organisation. However, only Admin members can invite people to join their organization.
You can do this under 'Invitations' under 'My Organisation' page, which can be found on top right corner of you dashboard.
Enter your colleague's email address, select their assigned role under the 'Select Role' dropdown list, and click 'Invite'.
The invitation link will be sent to the email address you entered, and your colleague will use it to sign up for their Finaxar account. Invitation links are valid for 7 days. After 7 days, the link will expire and you will need to send another invitation.
You can also revoke your invitations if you have entered the wrong email address or have changed your mind.