# Combining Identifier Strings

The identifier string that is used for matching is a combination of up to four strings from a factory management system or up to four scanner inputs that need to be combined into one string.

The Add and Delete command buttons manage how many strings are combined. The following parameters are available:

Parameters for combining identifier strings
Parameter | Description
--- | ---
Check box | Select an entry if it is to be deleted.
Name | The string must be given a name.
Length | The length of the string must be known and must be entered. This is important to be able to combine the correct string identifier.
Significant positions | The comma-separated positions or ranges (separated by hyphen) in the combined string that are used for matching.
Saved positions | The comma-separated positions or ranges in the strings that will be saved in the result.

If more than one identifier string is to be used, perform the following steps:

1. Press the Add command button to create a new entry in the table.

2. Issue the string a name.

3. Enter the length of the string.

4. Repeat steps 1-3 for every string to be added. Up to four strings can be combined.

The Start-End parameters in each row define the individual string positions in the combined string identifier that is used in the next step of the matching process.

The first part in the task selection process using an identifier string as an input, is to define which positions in the string that are to be activated:

- Enter the significant positions, to define which positions in the identifier string will be used for matching. The positions must be either comma-separated, or by range.