if
you want to use straight line to connect the activities or Transition
Curve 
if
you want to use curved lines, based on your requirement.The Process Flow tab has a floating toolbar and a drawing canvas. Drawing canvas is used to design the Process flow with the Tools, Activities, and OFSAA Widgets available in the floating toolbar.
Transition is used to control the
flow between various components in the Process flow. Transition connects
two activities and the flow is configured based on conditional expression
or decision rule. You can use Transition Line if
you want to use straight line to connect the activities or Transition
Curve if
you want to use curved lines, based on your requirement.
Split refers to a condition where an incoming transition is split to multiple transitions. In Merge, multiple incoming transitions are merged to a single transition. The Splitting and Merging of Activities are modeled through Gateways. Gateway can be Sequential, Parallel, or Multi Choice.
Parallel Gateway: A Parallel gateway is used when you want to have multiple transitions/flows which should be executed in parallel.
Sequential Gateway: A Sequential gateway is used when you want to have multiple transitions/flows which should be run in sequential.
Multi Choice Gateway: A Multi Choice gateway is used when you want to execute multiple transitions/flows based on decision rule.
Connector helps to connect two activities with different path (other than the default), in case if the default path is overlapping with some existing flow.
Human task requires human intervention to move to next Activity. For more information on stitching human tasks in your Process flow, see Human Tasks section.
Service task typically invokes an application component (for example, activity to invoke a business rule to calculate certain threshold). For more information on stitching service tasks in your Process flow, see Service Tasks section.
Sub Pipeline provides reusability of Pipelines. Using Sub Pipeline component, you can call another Pipeline from your parent Pipeline. For more information on how to use Sub Pipeline, see Calling another Pipeline from Your Parent Pipeline section.
Inline Process is used to group a set of processes within a process flow. It is a process flow within another process flow, which is not reusable like Sub Pipeline. For more information, see Inline Process section.
OFSAA widgets are used to execute OFSAA components like T2T definitions, PLC definitions (DT), Rules (Classification Rule and Computation Rule), Models in EMF, RRF Runs, Data Quality Groups, and RRF Processes through Process Modeller. For more information, see Configuring OFSAA Tasks in Your Process Flow section.
You can register a new component by entering details in the AAI_WF_COMPONENT_ REGISTRATION table. For more information, see Configuring Custom Components section in OFSAAI Process Modelling Framework Orchestration Guide.