Begin by exporting the desired data from Asana. Asana allows you to export project data as a CSV file. To do this, open the project you want to export, click on the "..." menu in the top right corner, select "Export/Print," and then choose "CSV." Save the file to your local system.

Open the exported CSV file in a spreadsheet application like Excel or Google Sheets. Review the data to ensure it includes all necessary fields and is correctly formatted. You may need to clean the data, such as removing unnecessary columns or fixing any formatting issues, to ensure it matches the schema you plan to use in ClickHouse.

Ensure you have ClickHouse installed on your system. You can download and install ClickHouse by following the official instructions on the ClickHouse website. Once installed, you’ll use the ClickHouse client to interact with your ClickHouse server.

Open the ClickHouse client and create a table that matches the structure of your CSV file. Use the `CREATE TABLE` SQL command to define the table schema. For example:
```sql
CREATE TABLE asana_data (
id String,
task_name String,
due_date DateTime,
assignee String
-- add more columns as needed
) ENGINE = MergeTree()
ORDER BY id;
```

Convert your CSV file into a format that ClickHouse can readily import. This typically involves ensuring that your CSV file uses the correct delimiters and that text fields are properly quoted. You can use simple command-line tools like `sed` or `awk` to adjust formatting if necessary.

Use the ClickHouse client’s `INSERT INTO` command to import the CSV data into the ClickHouse table. You can accomplish this using the following command:
```bash
clickhouse-client --query="INSERT INTO asana_data FORMAT CSV" < /path/to/your/file.csv
```
This command reads your CSV file and inserts the data directly into the specified table.

Once the data import is complete, verify that the data has been correctly transferred. Use a simple `SELECT` query to view the data in ClickHouse:
```sql
SELECT FROM asana_data LIMIT 10;
```
Check for any discrepancies or missing data and adjust your import process as necessary to resolve any issues.

By following these steps, you can manually move data from Asana to ClickHouse without relying on third-party connectors or integrations.