Join lines

Hi, karinafreitass 

Based on your description, I created data to reproduce your scenario. Tjhe pbix file is attached in the end.

Table:

You may create an index column in 'Query Editor' as below.

Then you may create a calculated column or a measure as below.

Calculated Column:

Result Column = 
IF(
    NOT(ISBLANK([8/27/2020])),
    CONCATENATEX(
        FILTER(
            'Table',
            [Index]=EARLIER('Table'[Index])||
            [Index]=EARLIER('Table'[Index])+1
        ),
        [Column2],
        " "
    ),
    CONCATENATEX(
        FILTER(
            'Table',
            [Index]=EARLIER('Table'[Index])-1||
            [Index]=EARLIER('Table'[Index])
        ),
        [Column2],
        " "
    )
)

Measure:

Result Measure = 
IF(
    NOT(ISBLANK(SELECTEDVALUE('Table'[8/27/2020]))),
    CONCATENATEX(
        FILTER(
            ALL('Table'),
            [Index]=SELECTEDVALUE('Table'[Index])||
            [Index]=SELECTEDVALUE('Table'[Index])+1
        ),
        [Column2],
        " "
    ),
    CONCATENATEX(
        FILTER(
            ALL('Table'),
            [Index]=SELECTEDVALUE('Table'[Index])-1||
            [Index]=SELECTEDVALUE('Table'[Index])
        ),
        [Column2],
        " "
    )
)

Result:

Best Regards

Allan

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