# Operations
Once a projection has been prepared for usage in Novacura Flow, you can define what operation to use in a machine step. Simply select the connector in the machine step and choose "Select operation..." in the operation tree.
There are a couple of different kinds of operations, typically a subset of the following kind of operations are available:
* Create - creates a new entity
* Read - query for entities
* Update - update an existing entity
* Delete - delete an entity
* Actions - an operation that potentially changes the state of one or many entities
* Functions - an operations that does not change state of any existing entity, i.e a pre-defined query, or create an entity with default values set
* Code - a way for you to, in the context of the OData endpoint, write your own code in C# that does what you define.
* Batch operations - multiple operations in one call
{% hint style="warning" %}
The OData connector supports a maximum of two levels of entity sets within the operation tree for a given projection. In this example, any additional entity sets under ***AddHandlingUnitTypesArray*** will not be visible in the operation tree. For entity sets that are in third level and beyond, you can use [Custom Request](/connectors/areas/business-systems/ifs-applications/ifs-odata/operations/custom-request.md)
\
{% endhint %}
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://help.novacuraflow.com/connectors/areas/business-systems/ifs-applications/ifs-odata/operations.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.